Abstract: A filter includes upper and lower filter members that form at least two opposed surfaces that face each other, a porous member contained in the filter member, and a coupling member having an opening that is open to the porous member so that the porous member communicates with the coupling member. In the filter, the filter member removes foreign matters contained in liquid, and the liquid from which the foreign matters are removed is discharged through the porous member and the coupling member.

Abstract: A multi-micron, multi-zoned woven metal wire mesh for the production of sand control screens. The multi-zone, dual micron layer is spirally wound on top of a perforated metal pipe. Second and third metal mesh filtration layers are spirally wound on top of the three-zone, dual micron layer, respectively. A perforated metal shroud is placed on top of the entire assembly to protect from the surrounding environment and acts as a protective cover.

Abstract: An internal spa filter for a spa, having a filter body with an inlet opening at its one end and a discharge orifice at its opposite end, the sides of such body are formed with auxiliary spa water inlet openings. The filter also includes a filter bag having a sheath encompassing the exterior of the filter body and a pocket extending inwardly from the front end of the sheath into the filter body from the main spa water inlet opening. Operation of the spa water circulation system draws spa water into the main spa water inlet opening through the filter bag pocket into the filter body while concurrently spa water is drawn transversely through the filter bag sheath and auxiliary spa water openings into the filter body, all of such spa water flows rearwardly out of the filter body through the filter body discharge orifice.

Abstract: A desiccant container (2) which comprises a generally cylindrically cross-sectioned cup, two dual-density fiberglass discs (6, 8), desiccant material (4), and a cap (16). The cup includes an outer annular portion, an inner tubular portion, and a bottom which connect together to define a space within. The cap (16) has a planar portion with an aperture for receiving the inner wall portion of the cup and is designed for receipt in the chamber to cover the opening. The cap further includes an outer annular rim portion extending transversely from the planar portion. The peripheral flange portion having tabs with an edge portion which permit the cap to cooperate with the outer wall portion having tabs with an edge portion which permit the cap to cooperate with the outer wall portion so that the cap can be retained within the chamber in one of a number of axially spaced positions to prevent shifting of, and escape of the desiccant.

Abstract: A liner and filter for filtering a heated tissue float water bath is described. In one embodiment, the liner and filter are a disposable one piece unit. In another embodiment, the liner and filter are two separate components and only the filter is disposable. The filter has a flat microcloth bottom and a plurality of support members extending across the flat microcloth bottom for sandwiching the microcloth there between to form the filter. The liner has a generally vertical wall with an outwardly extending top flange for positioning the liner and filter into the bath container and for easy removal. When the liner and filter are removed, the assembly carries with it any loose tissue fragments, paraffin or other contaminants, thus leaving the bath water clean and ready for reuse. The liner and filter can be circular, square or rectangular depending on the shape of the tissue float water bath container in which the invention is to be used.

Abstract: A filter support sleeve for use with a filter element to provide structural support for the filter element. The support sleeve encompasses the filter element and includes a metal strip wound in helical turns joined by a continuous spiral weld to form a hollow cylinder. The metal strip has substantially square perforation for passage of fluid flow through the support sleeve oriented such that when the metal strip is helically wound, a line parallel to each side of the square-shaped perforation is skew with the axial axis of the support sleeve. The support sleeve present an open structure while protecting the filter element from forces generated by the fluid flow during normal use or back flow during cleaning. When used with a pleated filter element, the support sleeve will not obstruct the entire length of the pleats.

Abstract: A filter bag (1) comprises a first thin plastic film (22); a second thin plastic film (21) having substantially the same size with the first plastic film and sealed to the first plastic film at a first side-peripheral edge (2a), a second side-peripheral edge (2b) opposite to the first side-peripheral edge and a bottom peripheral edge (2d) thereof to provide an open-top interior, and a filter sheet (5) having a length substantially equal to the first and second plastic films and a width smaller than the first and second plastic films. The filter sheet has a first longitudinal edge (5a) interposed and sealed together between the first side-peripheral edges of the first and second plastic films and a second longitudinal edge (5b), opposite to the first longitudinal edge, sealed to the inside of the first plastic film at an intermediate position in width of the filter bag.

Abstract: A sleeve or wrap that fits over a cartridge type filter whereby enhancing the effectiveness of that filter. A preferred embodiment of the invention is to fabricate this sleeve or wrap using the category of material commonly referred to as “nonwoven” taking advantage of one or more of the functional properties possible with the composition of this material such as the ability to capture large debris, filter out chemical elements, absorb oils and many other advantages beneficial to the filtering process. This sleeve or wrap may be fabricated as a one piece tube that slides snugly over the filter. Supplied as a blanket or wrap with a thin strip of hook material along one edge similar to that used in a “Velcro tm” hook and loop fastening system and with the nonwoven material of the wrap acting as the loop so the wrap may be fit snugly over a broad range of diameter filters.

Abstract: A substantially clog-resistant self-supporting fluid filter 100 for attachment to an open end of flow tube 118. Filter 100 comprises a substantially cylindrically shaped grid or fluid intake portion 102 having first end 112 and a second end 116. Fluid intake portion 102 comprises a plurality of substantially parallel longitudinal ribs 106 affixed to a plurality of substantially parallel circular ribs 108 at an angle to longitudinal ribs 106 thereby allowing a fluid to flow therebetween while preventing passage of debris intermixed with the fluid. Longitudinal ribs 106 and circular ribs 108 are substantially rigid such that they cooperate to be structurally self-supporting. End cover 114 is affixed to first end 112.

Abstract: A filter for use in a waste water discharge system including a first channel defining a receptacle for a filter and a second channel connected generally orthogonally to the first channel providing an outlet from the filter receptacle. The filter has an axial support of a pre-selected length, a plurality of bristles fixed to the axial support extending radially outward to define an outer margin. The outer margin of the bristles, at some portions along the pre-selected length, are at least equal to an inside dimension of the channel defining the receptacle. A handle is fixed to the axial support facilitating the placement and withdrawal of the filter element in the filter receptacle. A shield member is provided that is generally conformable to the inside surface of the filter receptacle. The shield member has a length dimension sufficient to cover the outlet leading to the second channel for blocking any flow of waste water into the second channel during replacement of the filter element.

Abstract: A screening device includes a screening element connected to a reinforcing element by a frictionally engaging clamping connection. Spacers located between the screening element and the reinforcing element provide a radial clearance therebetween. The screening element can be replaced when worn out, while the reinforcing element and associated parts can be reused with a new screening device. For this purpose, the screening element can be detached from the reinforcing element, which provides the actual support function, as a single unit by way of the frictionally engaging clamping connection. The clamping connection can be implemented by way of wedges or a conical seat.

Abstract: A filtering system for swimming pools includes a cylindrical filter housing in which a filter bag is supported in a perforated liner. A skimmer housing is mounted on the cylindrical housing and skims water off of the surface of the pool, which communicates to the inlet chamber through a perforated skimmer basket which catches debris floating on the surface of the pool water. The main drain of the pool is connected directly to the inlet chamber. An outlet of the cylindrical housing communicates directly with the inlet port of a pump that returns filtered water to the pool.

Abstract: A twist-on renewable filter comprising a one-piece hollow housing, made of polymeric material having a threaded adapter for attachment to a distribution head assembly. The filter housing is fabricated from components that are made of a polymeric material that are fused together to form the one-piece hollow housing. A filter media assembly is rigidly bonded at both ends within the housing. The renewable filter has an infinite life and can be removed and cleaned, for example, by reverse flushing the filter with a cleaning solution. A bypass valve 250 is provided within the filter that is designed to provide full closure for an infinite life. The bypass valve 250 is fully located within the one-piece hollow housing such that it cannot be disabled or tampered with. The bypass valve 250 functions to allow sufficient fluid to bypass the filter media when the filter media has become contaminated and will not permit the full volume of the normal oil stream to be filtered.

Abstract: A drain filtering system is disclosed, having a filter placed within a basket which is suspended from frame positioned underneath a drain grate atop the inlet to a storm drain. The filter is constructed from materials that filter out heavy metals, sediments, debris and hydrocarbons from the water passing through. The system includes a riser tube having an inlet and an outlet, where the inlet is positioned inside the filer, and the outlet is positioned external to the filter. The inlet is placed close to the top of the filter to allow a bypass fluid path for periods of high flow.

Abstract: A fluid filter includes a cylindrical pleated filter media disposed around a central perforated support core or self-supporting. An outer support sleeve comprising a extruded nylon, diamond-shaped mesh is stretched across the pleated media, and elastically conforms to the pleat peaks to structurally retain the pleats of the pleat peaks in fixed relation to one another. A bead of adhesive is then applied over the sleeve to fix the sleeve to the pleat peaks. End caps are disposed at opposite ends of the fluid filter.

Abstract: The present invention provides a method and device for preventing the formation of deposits in a drainage system (100). The device (10) includes a container (12, 212), connected by a flexible cord (20) to a stopper (22). An antimicrobial composition (24) is placed in the container and the container is inserted into a drain opening (102). The container moves to the bottom of the trap (106) of the drainage system. The container is preferably located at least partially beneath the water or drainage fluid (110) in the bottom of the trap. The cord and stopper prevent the container from moving beyond the trap. The cord and stopper allow for removal of the container from the drainage system, once the composition has been fully dispensed.

Abstract: A progressive filtration system for a chest drainage unit during continuous autrotransfusion comprising a gross filter for filtering incoming blood at the inlet portion of a collection chamber of a chest drainage unit and a conventional fine micron filter assembly located at the bottom portion of the collection chamber for refiltering collected blood prior to reinfusion of that blood back to the patient. The micron filter assembly includes a valve cap at the top portion of the assembly that functions as a plug to seal the top portion of the assembly and as a one way valve that permits reflux of later developing blood clots that might clog the tubing once the blood has already passed through the assembly. The valve cap is also adapted for sealing engagement with a drop tube that places the filter assembly in fluid flow communication with an outlet of the collection chamber located at the top portion of the chamber.

Abstract: A filter for removing particulate matter from water flowing into an inlet, such as a catch basin is disclosed. The filter may comprise an envelope of filter material adapted to receive an inlet cover device, such as a catch basin grate. The inlet device may be inserted within the envelope and placed in an opening of the inlet. Water, for example, may then be double filtered before entering the inlet. A roll filter comprising porous material is also disclosed that may be used in combination or alone when filtering runoff entering a curb drain or other inlet.

Abstract: A filter unit comprises a housing through a wall of which is formed an aperture, an annular insert of a plastics material located in said aperture to make sealing contact with the defining walls of the aperture, a closure member removably mounted in, to make sealing engagement with, the annular insert, and a filter cartridge mounted on the closure member to extend into the housing, the closure member and filter cartridge being locatable on and removable from the housing as a unit.

Abstract: Cast semi-permeable membranes made from synthetic polymer used in reverse osmosis, ultrafiltration and microfiltration are treated with a non-leaching antimicrobial agent to prevent its bio-fouling and bacterial breakthrough. The semi-permeable membranes include a polymeric material and a non-leaching antimicrobial agent that is incorporated into and homogeneously distributed throughout the polymeric material. The polymeric material, in the case of one membrane, may be cellulose acetate. In the case of thin film composite polyamide membranes, the antimicrobial agent is incorporated in a microporous polysulfone layer that is sandwiched between a reinforcing fabric and an ultrathin polyamide material. The invention also includes a treatment of flat and hollow fiber semipermeable membranes made with polysulfones and polyvinylidene fluoride.

Abstract: Embodiments of a gravity-flow filter cartridge are described for removing water-borne parasites, and other contaminants such as chlorine, lead, and organics from water. The filtration cartridge includes a liquid porous plastic filter, which has pore diameters large enough to let water pass at acceptable flow rates under only the force of gravity, while the matrix creates a tortuous path which traps parasites and other microorganisms that are typically in the approximately 3-9 micron size range. The filter may include interstitial carbon and other additives to improve performance. The filter may be shaped to provide a large surface and an optimized wall thickness for providing beneficial filter capacity and water flow rate.

Abstract: A filtration system is provided for removing oil and/or hydrocarbons from blige water that collects in the blige of a marine vessel to ensure discharge of oil-free water into the surrounding waters of the vessel. The filtering medium of the system is composed of a mixture of peat, anthracite and bentonite resulting in a composition that is hydrophobic and olephilic. Due to the chemical composition of the medium, it burns efficiently and can be disposed of in the onboard incinerators of the vessel producing over 17,000 BTU's per pound. Also, the filtration system employs full backwash capability for filtering liquids combined with particulates.

Abstract: Oil or fuel filter includes a holder element with an inlet and an outlet for liquid, an outer container fixed to the holder element, and a filter insert housed in the outer container. The insert includes an inner container, a filter element and a perforated tube placed centrally in the filter element, all of these elements being glued to each other so that they form a replaceable filter unit with a collecting container for contaminants.

Abstract: The present invention relates to a novel filter element having a septum with a staged pleating that repeats a pleating sequence having a major (longest) pleat, a minor (shortest) pleat and at least one intermediate pleat therebetween. The intermediate pleat(s) have pleat heights that are evenly distributed within the range of pleat heights bounded by the pleat height of the minor pleat and the pleat height of the major pleat. In two particular embodiments of the invention, the pleat height ratios of the major, intermediate and minor pleats are 3:2:1 and 4:3:2:1. In an filter element, the pleated septum may be held between an inner core and an outer guard. The tip of the major pleat in each pleating sequence may be in contact with the inner core of the filter element. The septum may also include drainage layers on upstream and downstream of the filter material layer.

Abstract: A simple, economical acid rapid method for determining the contaminate particle size appearing in a fluid being filtered includes a filter housing that eliminates fluid bypass with a multi-layered laminated filter disposed therein.

Abstract: A support-equipped extraction bag which comprises a bag main body containing or capable of containing an extraction-subject material and produced by using a sheet complex having a support disposed along the centerline of a water-permeable filtering sheet member and bonded thereto, and using a bag making machine (and a filling machine, if necessary) while folding it in two, and a support member, wherein extraction can be safely effected by tearing the head of the support-equipped extraction bag, bending the right and left ends inwardly downward or upward so as to spread the head, simultaneously downwardly bending the leg continuous with the head to place it on an extraction vessel, and pouring an extraction liquid (boiling water) over an extraction-subject material which is filled through the tear in the head or which has been filled in advance.

Abstract: An apparatus and method for treatment of waste water effluent includes a main conduit connected to a source of waste water, and a removable filter positioned within the main conduit, the filter comprising a light weight particulate material for filtration of the effluent. A drain field for filtration treatment of waste water effluent comprises a source of waste water effluent, a main conduit in fluid connection with the source of waste water, and at least one in-line filter positioned within the main conduit, the filter comprising light weight particulate material. The drain field may comprise at least one extension conduit connected in fluid communication with the main conduit and extending substantially upwardly therefrom, said extension conduit having a removable cap comprising a sensor to thereby generate a signal when water in said extension conduit reaches a predetermined level.

Abstract: A filter (110) is provided with a fixture (70) having a first set of axially extending inner pillars (72, 74, 76, 78) defining a first cylinder (80) along inner bend lines (34) of inner pleat tips (32) of an annular pleated filter element (22), a second set of axially extending outer pillars (82, 84, 86, 88) defining a second cylinder (90) extending along outer bend lines (38) of outer pleat tips (36) of the filter element (22), inner and outer circumferential rings (92 and 94) extending around the respective first and second sets of pillars and circumferentially spacing and supporting such pillars, and a plurality of radial spokes (100, 102, 104, 106) at an axial end (98) of the fixture (70), each spoke extending radially between a respective inner and outer pillar and radially spacing and supporting respective inner and outer pillars in radially spaced concentric relation defining a reception annulus (108).

Abstract: A fuel filter assembly adapted for disposition in a housing includes an inner filtration element, an outer conductive surround and end caps which position and secure the filtration element and conductive surround. The filtration element preferably includes an outer layer of depth filtration media and an inner pleated paper element. The conductive surround is preferably conductive extruded plastic mesh. The end caps may be formed of a fuel tolerant plastic such as nylon or acetal. The filter assembly may be disposed in a housing having suitable inlet and outlet fittings and a conductive path for achieving electrical conductivity from the exterior of the housing to the conductive surround for facilitating draining off of an electrical charge.

Abstract: A filter element (10) is provided which can be used to remove microsize contaminant particles (i.e., about 0.5 &mgr;m to about 25.0 &mgr;m) from aviation fuel. The filter element (10) includes a cylindrical pleated filter media (14) and an exoskeleton support structure (16) supporting the filter media (14). The filter media (14) has a pleat density of about eight to about thirteen pleats per inner diameter inch and is formed only from cellulose-fiber-free and woven-mesh-free layers. The exoskeleton support structure (16) is a screen which is thermally bonded to the pleats' peaks in such a manner that the filter media (14) is sufficiently supported without conventional endoskeleton support layers.

Abstract: The present invention encompasses a process for producing synthetic hydrocarbon products in a reactor. The focus of the present invention is on a novel filtering system for separating synthetic hydrocarbon products from catalyst within the reactor. The filtering system of the present invention could also be used for a variety of similar processes where it is desirable to separate a solid from a liquid within the solid/liquid mixture. Finally, the present invention discloses a novel filter and a method for making the filter.

Abstract: A membrane element filtration unit comprises at least one membrane or filter element, and in the case where the unit comprises two or more membrane or filter elements said elements being coaxially connected to each other by means of interconnecting elements thus forming an assembly, having each of its ends provided with an end member, the assembly being surrounded by a composite glass fiber and resin layer which when hardened forms a rigid cylindrical shell.

Abstract: Two perforated metal sleeves are secured in radially spaced coaxial relation one within the other between a pair of rigid end caps that are releasably secured to opposite ends of a plurality of rods which support the caps removably and sealingly over opposite ends, respectively, of the sleeves. An annular filter cartridge is releasably secured in the radial space between the sleeves with resilient annular end caps on opposite ends of the cartridge disposed in releasable, sealing engagement with the rigid end caps. Fluid that is to be filtered is delivered to the radial space separating two annular filter elements in the filter cartridge. When one or the other of the end caps is removed from the support rods the cartridge can be removed from between the sleeves and replaced without having to destroy the sleeves or the rigid end caps.

Abstract: A filter is disclosed that includes a cylindrical filter element having a longitudinal axis, an outer periphery, an inner periphery, and a plurality of longitudinal pleats arranged in a spiral configuration in close proximity to one another. Each of the pleats has a pair of legs, and the legs of each pleat are joined to one another at a root. The roots of adjacent pleats are radially spaced from one another about the inner periphery of the filter element.

Abstract: A media is used to remove species from aqueous solutions, particularly in the treatment of water to enable it to be suitable for drinking. The media includes a material selected from the group consisting of zirconium hydroxide, titanium hydroxide, hafnium hydroxide and combinations thereof. A preferred form of the media is a layer having an aspect ratio of at least 1:1, more preferably, at least about 10:1. Removed from the water are species selected from the group consisting of arsenate, selenate, chromate, borate, perchlorate, fluoride and combinations thereof. In particular arsenite (As+3) containing species are also removed from water. Arsenite may be removed from water to levels not greater than 10 parts per billion with a single exposure to the media. The media is selective for certain species over others.

Abstract: A sequential flow filtration chamber for treatment of waste water effluent from a septic tank comprises an inlet positioned in fluid communication with the septic tank for receiving waste water into the chamber, at least one partition positioned within the chamber so as to define a substantially sequential flow path for the waste water, a filter positioned within the flow path for filtering the waste water flowing therethrough, and an outlet positioned in fluid communication with the flow path for discharging filtered waste water from the chamber. The chamber may include a sequential flow path disposed substantially vertically or substantially horizontally. A sequential flow nitrification drain field for filtration treatment of waste water comprises a source of waste water, and at least one sequential flow filtration chamber. The source of waste water for the drain field is preferably a septic tank. The drain field may comprise a plurality of chambers connected in fluid communication.

Abstract: In accordance with this invention, an improved filter resembling an envelope is disclosed. The filter envelope for the filter frame element includes an enclosure, the enclosure being constructed from planar first and second filter paper members lying atop one another. The first and second filter paper members each have a lateral, medial, base, and top sides, the lateral, medial, and base sides being connected to each other, respectively, to define the enclosure. The top side of the first member is not connected to the top side of the second member so as to define an opening in the enclosure to receive the frame. A closure is formed from a planar third filter paper member which is connected to a portion of the enclosure being proximate to the opening. The third filter paper member is movable between a first position and a second position, the second position being suited to close the opening.

Abstract: A portable liquid-solid separator tank has a bed, surrounding exterior walls, a dividing wall. The exterior walls of the tank include a gasket door to allow easy removal of the filtered sludge. The exterior walls of the tank support sludge include inlet valves where the sludge is provided by a hose from a storage and/or mixing tank. The exterior walls also include a liquid outlet valve or valves for the filtered liquid to be removed and roller wheels that enable the tank to be easily transported. The tank contains a filter media mounted on a filter media support structure supported by the interior of the bed, exterior walls, and the dividing wall. The filter media support structure is composed of perforated metal supports and expanded metal supports. The use of the expanded metal supports in the filter media support structure increases the opening space in the support structure and reduces the amount of time it takes to filter the sludge.

Abstract: A subterranean filter to remove particles from production fluid in a well includes a perforated inner member, at least one filter membrane made of a non-woven polymer material and a metal braided layer installed around the membrane and inner member to provide a filter having improved permeability and resistance to chemical and physical forces.

Abstract: An improvement to a spiral wound filtration membrane is the provision of a fluid-permeable protective sheath around the inner spacer of the membrane pocket.

Abstract: A catch basin insert or filter is supported in an open type curb inlet storm drain found on streets and in parking lots. Catch basin filters and inserts are designed to collect coarse sediments, oil, grease and debris from storm water runoff. Such filters normally require support on all four sides of a grate using the weight of the grate. A loop and rod attaches one or more sides of a filter or insert inside a curb inlet storm sewer vault instead of using the weight of the grate.

Abstract: A coalescing element is provided which is capable of separating a continuous phase fluid from a discontinuous phase fluid. The coalescing element includes a wrap structure which facilitates the coalescing process by conglomerating smaller droplets of the discontinuous phase fluid into larger droplets which may be of a size that will prevent them from being re-entrained.

Abstract: A tow wound filter cartridge comprises a permeable core and one or more tows wound in a helicoidally or diamond-like shaped way or serpentine-like way around the core, having a zero twist degree, in order to obtain a filter rating of below 75 micrometer. The tows may comprise metal fibers. Preferably the tows of the filter cartridge consist only of metal fibers.

Abstract: A bag, particularly adapted for absorbing hydrocarbons dispersed in smaller quantities of water, has a ball-like shaped body formed from oleophobic netting materials. The bag body includes a tubular-shaped outer sleeve positioned about a tubular-shaped inner sleeve to form an interior space therebetween. Adjacent end portions of each sleeve then are connected so that an absorbent medium in the bag interior space is fully enclosed. The inner sleeve defines a central passageway through the bag. To hold the bag during use, a cord loop may be disposed in the central passageway with a knotted end of the cord joined with one of the sleeve end portion connections. A looped end of the cord then extends from an opposite end of the central passageway to provide convenient means for attaching the bag to a support while the bag is immersed in a hydrocarbon-water mix. As hydrocarbons are drawn to strands of the bag netting and then collect in voids of the netting, the bag discolors.

Abstract: A drain filtering system is disclosed, comprising a filter placed within a basket which is suspended from frame positioned underneath a drain grate atop the inlet to a storm drain. The filter is constructed from materials which filter out heavy metals and hydrocarbons from the water passing through. The filter also has overflow outlets to prevent back-up of storm water during periods or heavy rain. The basket is constructed from a corrosion resistant material, preferably high density polyethylene which can withstand the extreme pressures exerted by waste and water collected within the filter.

Abstract: Filter elements for draining wastewater into the soil in leach fields comprise net sacks filled with scrap rubber or plastic chips and supplied with fabric filter cloth. Leach fields are constructed by excavating trenches, placing a first row of filter elements at the bottom of the trenches, installing a drain pipe on top of the row of filter elements, placing a second row of filter elements on top of the first row and the drain pipe, overlapping the pieces of filter cloth to provide a barrier to the surrounding soil, and backfilling the trench with soil.

Abstract: A bacteriostatic filter cartridge having a porous core member about which is layered a yarn and/or a polyester membrane and/or melt blown web of polypropylene and/or a trilaminate polypropylene membrane, any or all of which may be impregnated with an antimicrobial agent. The filter cartridge is sized so as to fit tightly into a cartridge housing of a fluid filtration system. Fluid passing through the cartridge housing will be filtered by the filter cartridge to remove contaminants from the water and which prevents the growth of bacterial and other microorganisms on the filter media.

Abstract: A septic tank effluent filter includes a housing positioned external to and downstream a septic tank for receiving the effluent prior to it being released into a drainfield positioned downstream the housing. The housing includes an inlet port and an offset outlet ports on an opposing wall for connection between the septic tank and drainfield. A cylindrical container is carried within the housing and is connected directly to the outlet port for having the effluent flow from within the housing through the uniformly perforated cylindrical wall of the container to outlet port. A circular base plate of the container provides a baffle and prevents the undesirable direct streaming of the effluent from the inlet port to the outlet port. A plastic mesh bag is filled with polystyrene plastic beads having a large surface to volume ratio, thus a large surface area within a desirable space.

Abstract: An insert for use in a drain basin, comprising an outer wall defining a periphery of the insert and having a top edge and a bottom edge. A perforated bottom surface extends across the lower periphery of the insert. A filter, resting on the perforated bottom surface, has a peripheral edge enclosing a central portion. A flange extends inwardly from the top edge of the outer wall past the peripheral edge of the filter. The flange directs drainage water past the periphery of the filter and to its more central portion, whereupon impurities within the drainage water are extracted and filtered water exits through the perforated bottom surface into the drain basin. In a preferred embodiment of the invention, the inward-extending flanges are angled downward toward the filter. In a second embodiment, the filter, bottom surface and inward-extending flanges are arranged in a cartridge, which is removably placed inside the periphery of the outer wall.

Abstract: A filter for a filter vessel which converts the filter vessel to use disposable filters for removing hazardous particulate matter from an aqueous flow. The filter includes a rigid support housing having an input passage for the aqueous flow, an exit passage for the aqueous flow, an internal sealing surface and a locking seal located adjacent to the input passage to securingly engage the filter vessel for the aqueous flow. The invention also includes a sleeveless disposable filter cartridge. The cartridge includes a flexible filtering medium having first and second ends. A terminal seal is affixed to the first end of the filtering medium for sealing engagement with the filter vessel and a wall seal on the second end of the filtering medium for engagement with the internal sealing surface of the support housing.