Abstract: A capsule for holding, irradiating, and eluting a material is provided. Methods of fabricating and using the capsule are also provided. The capsule may include a multidiameter tube with a first end region, a second end region, and a middle region. Washers and filters are provided in the end regions and the end regions may be sealed using various methods and materials with the end caps press fit into the end regions. The middle region is designed to store a material to be irradiated by a neutron flux source. The capsule components may be made from materials having a low nuclear cross section so that the capsule may be handled safely after an irradiation step is performed. The capsule is also designed to have a symmetric configuration as an elution and irradiation column so that the same capsule may be used to elute the material within the middle region of the capsule after an irradiation step is performed.

Abstract: A filter, comprising: a housing defining an inner cavity; an inner sleeve disposed within the housing, the inner sleeve having portions in a spaced relationship with respect to the an interior surface of the inner cavity; a plurality of tab members extending away from the inner sleeve, the tab members being configured to be removably secured to a feature of a cap, the cap being configured to engage the housing to provide a first position and a second position with respect to the housing, wherein the first position seals the inner sleeve to the housing and a fluid filtration path from an inlet of the filter to an outlet of the filter is defined by the inner sleeve and the second position provides a fluid drain path through an opening in the cap, the fluid drain path being closed when the cap is in the first position; and a filtration media disposed within an interior area of the inner sleeve, wherein the filtration media is disposed in the fluid filtration path and fluid flow through the outlet opening must pa

Abstract: A vertical membrane module unit is allowed to be installed even at a place with a low ceiling. A housing containing a vertical membrane module unit is held by a housing holder. The housing holder holds the housing tiltably such that the housing can be positioned with the longitudinal direction of the membrane module unit being substantially vertical when treated water is extracted, and the housing can be positioned with the longitudinal direction of the membrane module unit being substantially horizontal when the membrane module unit is removed from the housing.

Abstract: Disclosed is an integrated paper wherein the paper has capabilities and functionalities provided by both the fiber and the active agent ingredients, and a method of immobilizing the active agents within the integrated paper. The tight pore structure of the integrated paper of the present invention, a mean pore diameter of less than about 2 microns, provides short diffusion distances from a fluid to the surface of the paper ingredients by adsorption or diffusive interception making it an excellent medium for fluid filtration. The integrated paper of the present invention can further include a microbiological interception enhancing agent. The integrated paper can be formed using, preferably, wet laid paper-making processes for speed and efficiency. Also disclosed are devices utilizing the integrated paper useful in fluid filtration.

Abstract: A filter with installation integrity permits fluid flow only in a first installation condition and not in a second undesired or mis-installation condition, including improper alignment or mounting of a filter element in a housing, an incorrect replacement filter element, absence of a filter element, and an incorrect housing cover. A magnetically actuated valve has a piston controlling fluid flow according to installation condition.

Abstract: Filter module and filter unit with an inlet for medium that is to be filtered, and with an outlet for the permeate, with at least one filter sheet, a first spacer adjacent to the media side and a second spacer adjacent to the permeate side, the spacers being designed with a draining action, and the first spacer being connected to an inlet and the second spacer to an outlet, wherein the at least one filter sheet forms a first filter unit together with the two adjacent spacers, the filter sheet is designed as a single filter or a filter stack, the first spacer is designed to be impermeable to liquid on its outer face directed away from the filter sheet and is sealed off at its boundary to the outlet end, and the second spacer is designed to be impermeable to liquid on its outer face directed away from the filter sheet and is sealed off at its boundary to the inlet end.

Abstract: A filter system includes a filter configured to regulate fuel pressure as well as automatically vent air from the filter. A pressure regulator valve is positioned in the top of a standpipe of the filter. The filter includes a filter cartridge with top and bottom end caps. The top end cap of the filter cartridge has a hole with radial sealing gasket, which seals against the top of the standpipe to prohibit flow from bypassing the filter cartridge. This arrangement exposes the regulator valve to the fuel and/or air at the top of the filter housing. Pressure in the housing opens the valve, allowing air and/or fuel to be vented through the standpipe, and back to the fuel tank.

Abstract: A blood treatment filter which comprises a housing including an inlet and an outlet, and a filter unit for filtering blood containing erythrocytes, platelets and leukocytes as blood cell components is provided. The filter unit comprises a main filter unit which virtually removes predetermined cell components from blood and passes the remaining blood cell components, and a pre-filter unit which is arranged at the up-stream side of the main filter and virtually does not remove blood cell components. The pre-filter unit has a permeability rate of 70 to 90% for micro particles having an average particle size of 6 ?m which are contained in a suspension and passed by gravity.

Abstract: One embodiment is a filter assembly wherein the shape of the filter is a non-circular geometry. Other embodiments include unique apparatus, devices, systems, and methods to remove contaminates from a flow of fuel while at the same time providing a unique filter and filter assembly geometry. Further embodiments, forms, objects, features, advantages, aspects, and benefits of the present application shall become apparent from the detailed description and figures included herewith.

Abstract: A diverter module is incorporated into a filter cartridge. The module employs a radial passage which diverts fluid to be filtered to the radial periphery of a filter element. The filtered fluid flows inwardly and axially through a transfer passage for discharge from the filter cartridge.

Abstract: A fluid treatment device includes at least one treatment module (“pod”) releasably connected to a head unit, the pod and head unit each including riser tubes which may be connected to adjacent riser to form a flow passage through the fluid treatment device. A connection mechanism allows a control valve to be rotatably connected to a fluid treatment device so that it may be oriented as desired.

Abstract: A filter canister including a frame; a sheet of flexible fabric material that allows the flow of water therethrough, the sheet of flexible fabric material being connected to the frame in a manner defining an internal zone whereby substantially all fluid entering the internal zone from an opposite side of the sheet of flexible fabric material passes therethrough; and a conduit having a first end located externally of the frame and a second end located within the internal zone defined by the sheet of flexible fabric material; wherein, upon connection of the first end of the conduit to a fluid intake system, fluid is drawn through the sheet of flexible fabric material into the internal zone, thereby filtering the fluid, and filtered fluid is drawn through the second end of the conduit for delivery into the fluid intake system. A system and method for filtering fluid intake water are disclosed.

Abstract: A filter cartridge which is environmentally friendly in that it is made up of components which are all incinerateable. The ends of a filter element are sealed using potting compound and plastic endcaps. The upper endcap, which is closed, has a pressure relief aperture associated therewith to prevent bowing. In a plugged filter condition the high downward pressure introduced on the upper endcap is compensated by providing the cartridge with centering ribs which bottom on an associated ledge in the housing to provide a positive stop for the top endcap, preventing it from being driven down into and through the filter element. Rubber gaskets are associated with the respective endcaps, and are reliably secured to the endcaps by being snap fit into grooves molded into the plastic of the endcaps. The lower endcap utilizes a simple radial seal gasket which is both highly effective and also positioned to avoid structural crushing forces on the cartridge. A keying system prevents the installation of improper filters.

Abstract: A depth filter design is disclosed which has little if any open void area upstream of the media. Preferably, it also has little if any open void area downstream of the media as well. A preferred embodiment uses layers of stacked, fibrous media with several of the layers being separated from the others by spacers which serve to compress the media and to prevent the bypass of fluid around the media adjacent the inner wall of the housing. Several designs for attaching the end caps which allow for the compression of the media are also disclosed.

Abstract: The present invention comprises a process for filtering a slurry and a filter cartridge construction for filtering a slurry having a filtration medium formed of a depth filter such as a cylindrical seamless fibrous depth filter comprising a nonwoven fibrous mass, woven fibers, a plurality of nonwoven fibrous layers or a fibrous felt or the like or a wound depth filter retained within a housing substantially free of an open void volume upstream of the depth filter which causes separation of solid particles from a slurry being filtered The filtration medium is divided into a plurality of depth filter segments by spacers which are spaced apart from each other along the length of a filter cartridge housing which houses the depth filter, The spacers serve to divide the depth filter medium into depth filter segments and to allow fluid to pass there through along a defined path defined by the configuration of the open portions of the spacers.

Abstract: A fuel filter assembly for a combustion engine, including a two-part filter housing, a filter element, and a restriction sensor, including an external visual display apparatus for indicating when to replace the filter element. As fluid pressure increases within the filter housing, the visual display apparatus correspondingly displays the increase in pressure. When the pressure sensor detects an amount of pressure at or in excess of a predetermined amount, the visual display apparatus indicates replacement of the filter element. A modified embodiment including an electronic pressure sensor and a remote display unit is also described.

Abstract: A fluid treatment element comprises a fluid treatment pack including a fluid treatment medium. The fluid treatment pack has a hollow interior and a barrier is disposed in the hollow interior. The barrier separates a blind region in which fluid cannot flow between the hollow interior and the fluid treatment pack from an open region in which fluid can flow between the hollow interior and the fluid treatment pack and prevents fluid from flowing between the blind region and the open region. The fluid treatment pack also has an end region having a sealed end. The fluid treatment element defines a flow path for process fluid to be treated passing in a lengthwise direction through a portion of the fluid treatment pack.

Abstract: A fluid filtration system includes a filter receiver located in a fluid reservoir housing and a replaceable filter module adapted to mount in the filter receiver. Fluid to be filtered is exposed to a filter media included in the filter module and mounted in a filter chamber provided in the filter receiver. The filtered fluid is discharged into a fluid reservoir located in the fluid reservoir housing and outside the filter receiver. Low-pressure fluid is then pumped from the fluid reservoir to a fluid user and fluid discharged from the filter user is conducted to the filter chamber for filtration in the filter media.

Abstract: A filter adapter for removing metallic particles from fluid. The adapter is cylindrical in shape and includes an attachment insert for mounting the adapter between a source in a fluid flow system and a conventional filter. The adapter has a ring shaped magnet held in the housing of the adapter by magnet holders. The adapter has a plurality of perforations in the top and bottom for the flow of unfiltered fluid from the fluid source, through the adapter, and to the conventional filter. The attachment insert is hollow so as to allow filtered oil to flow back from the conventional filter to the fluid system the adapter is attached to.

Abstract: A T-handle for a filter includes an integral mechanical indicator. The T-handle indicator has a threaded portion that extends through a hole in the filter cover and retains the cover to a canister. The indicator includes a spring-biased button that provides a visual indication of whether the element needs to be replaced. The button is received in a body that is open to the pressure on the downstream side of the filter element. A pair of clips on the button engage the indicator body to retain the button in the inward (element change) position. The clips can be accessed when the T-handle indicator is removed from the filter to return the button to the outward (fresh element) position. The indicator button includes an axially-elongated slot extending radially through the button, and the body includes a corresponding pair of holes on opposite sides of the slot.

Abstract: Porous poly(aryl ether ketone) Membranes, Processes for Their Preparation and Use Thereof Porous poly(aryl ether ketone) (PAEK) articles are prepared from PAEK/polyimide blends by selective chemical decomposition and subsequent removal of the polyimide phase. Porous PAEK articles exhibit highly interconnected pore structure and a narrow pore size distribution. The porous PAEK articles of the present invention can be utilized as a porous media for a broad range of applications, including membranes for fluid separations, such as microfiltration, ultrafiltration, nanofiltration, and as a sorption media.

Abstract: A filter apparatus comprises a ring secured to a filter cover so as to engage a center tube extending within a filter element to retain the center tube and the filter element. A method of assembling a filter apparatus is also disclosed.

Abstract: Generally, a magnetically enhanced oil filter apparatus includes a cartridge housing which includes an oil input channel and an outlet channel. The cartridge housing defines a cartridge interior space. A magnet unit is affixed to an outside portion of the cartridge housing, whereby a magnetic field from the magnet unit extends into the cartridge interior space providing an interior magnetic field zone. A hollow annular (e.g. cylindrical) filter element is employed. Filter positioning means are provided for supporting and positioning the hollow cylindrical filter element. Oil flow control means are positioned so that portions thereof enter the interior magnetic field zone, for directing oil flow to and from the hollow cylindrical filter element.

Abstract: A filtering device, especially a suction return filter includes a filter housing having two useful connections and a tank connection, and accommodates at least one filter element. The filter housing also provided with three return valves, two of which are held in the closing position by spring loads. All of the return valves are combined as a module at one end of the filter housing. The remaining return valve is configured as an integral constituent part of one of the spring-loaded return valves, has an opposite opening direction relative to it, and is not spring loaded. This arrangement enables the return valve unit to have a compact arrangement which can be structurally easily connected to the filter housing at a central point.

Abstract: A filtration device for separating concrements, fragments or other body material from liquids which are processed by means of a lithotripter connected to a suction device equipped with a peristaltic valve and sucked out of body cavities. The device has a functional zone having an inlet zone connected at one end to the lithotripter, and an outlet zone connected to the suction device. There is a collection zone mounted on the functional zone and connected to the other end of the inlet zone. A filter element is disposed between the functional zone and the collection zone, so that body material processed by the lithotripter will be deposited in the collection zone, and the filter element will separate the body fluids collected by the lithotripter from the body material.

Abstract: An annular filter element defining a hollow core is mounted within a cylindrical housing having a closed end and an open end by using a single piece, molded insert. The single pieces molded insert has a cup portion which extends into the hollow core of the filter element and a cylindrical portion which projects from the end of the filter element. A radially extending flange projects from the insert and engages the end of the filter element while a scalloped end of the cylindrical portion abuts the closed end of the housing. The scalloped end has a series of triangular openings The cup portion of the insert has an opening through the bottom thereof which receives a standpipe on a filter element support.

Abstract: A pressure vessel comprises a top wall, a bottom wall, a side wall extending between the top wall and the bottom wall, and a chamber formed by said walls, an inlet port extending through one of the walls for introducing fluid to the pressure vessel, an outlet port extending through one of the walls for removing fluid from the pressure vessel, a pressure gradient member located within the chamber of the pressure vessel through which fluid passing through the pressure vessel flows as the fluid passes through the pressure vessel, the pressure gradient member including an outlet port, and a flexible resilient tube attached to and extending between the outlet port of the pressure gradient member and the outlet port of the pressure vessel for mounting the pressure gradient member within the chamber formed by the walls of the pressure vessel and for connecting the outlet port of the pressure gradient member to the outlet port of the pressure vessel and for providing substantially uniform support of a load on the pre

Abstract: A filter for filtering liquids, especially fuel, which includes a concentric housing, an unfiltered liquid inlet, and filtered fluid outlet, and a backflow member. A concentric filter element, with a dirt collecting chamber in the lowermost part thereof, is disposed in the housing, which is closed with a cover. The housing also contains a riser pipe having a return bore hole in the uppermost part thereof, as well as a return pipe. An intermediate pipe, which is sealingly closed by the cover, is disposed above the riser pipe, and the filter element is removably attached to the intermediate pipe.

Abstract: A combined oil filter and magnet apparatus of the invention generally is comprised of an oil filter and a removable and reusable magnet unit attached to the oil filter. The removable and reusable magnet unit attracts and retains ferro-magnetic particles present in the oil flowing inside the oil filter, thereby separating those particles from the flowing oil. Inside the oil filter, an oil flow director is provided to direct oil flow to the vicinity of the removable and reusable magnet unit. With a first embodiment of the invention, the removable and reusable magnet unit is partially received in a centrally located filtered oil flow space inside the oil filter. With a second embodiment of the invention, the removable and reusable magnet unit is completely external to the interior of the oil filter.

Abstract: A disposable filter cartridge, in which the entire filter cartridge is disposable. The filter cartridge includes a tubular filter element substantially permanently retained to a lid such that the filter element cannot be removed from the lid without extreme force. The filter element includes a ring of filter media having ends potted in cup shaped end caps. The lid includes a central hub that is inserted through the opening in on of the end caps and ultrasonically deformed or flared radially outward to provide a lip that engages the top end cap for axial retention. The filter element is free floating and can be moved or tilted a small degree axially and can also be freely rotated relative to the lid.

Abstract: A fluid filter assembly includes a filter housing, a filter element, and an outlet conduit coupled to the filter housing to discharge liquid fluid from a filtered-fluid region in the filter element. An elongated grommet is mounted on the outlet conduit and positioned in the filter housing to seal against an outer surface of the filter element and an inner surface of the filter housing.

Abstract: Length-adjustable filter cartridges are provided which in preferred embodiments include at least one length-adjustable end cap attached to an end of a generally cylindrical filter body. The length-adjustable end cap most preferably includes an annular stationary ring member which is attached to one end of the filter body, and a moveable connection member slideably received within said annular stationary ring member so as to be moveable longitudinally relative thereto. A seal is formed between the stationary ring member and the moveable connection member so as to seal against fluid leakage yet permit relative axial movement (length adjustment) therebetween. In use, the filter cartridges may be adapted to fit conventional standardized bag filter cartridge housings even though the physical size and/or geometries of the metal support basket thereof is non-standard.

Abstract: A fluid filter has a filter element for filtering fluid. A nutplate having a threaded mounting portion is adapted to threadedly engage an externally threaded filter head. An inner seal retainer is positioned between the nutplate and the filtering element in order to define a hollow interior. The inner seal retainer has at least one stiff hollow web extending in a radial direction adapted to provide a space for transmitting fluid between the nutplate and the filter element. An inner radial seal is attached to the inner seal retainer for sealing the filter element with the filter head.

Abstract: A device for the continuous further transport of air in a fuel system includes a container with an inlet orifice and an outlet orifice for the fuel. A tube provided in the container extends from the outlet orifice and opens into a collection space for air in the container. The invention also relates to a replaceable unit for such a device.

Abstract: A T-handle for a filter includes an integral mechanical indicator. The T-handle indicator has a threaded portion that extends through a hole in the filter cover and retains the cover to a canister. The indicator includes a spring-biased button that provides a visual indication of whether the element needs to be replaced. The button is received in a body that is open to the pressure on the downstream side of the filter element. A pair of clips on the button engage the indicator body to retain the button in the inward (element change) position. The clips can be accessed when the T-handle indicator is removed from the filter to return the button to the outward (fresh element) position. The indicator button includes an axially-elongated slot extending radially through the button, and the body includes a corresponding pair of holes on opposite sides of the slot.

Abstract: A disposable filter cartridge, in which the entire filter cartridge is disposable. The filter cartridge includes a tubular filter element substantially permanently retained to a lid such that the filter element cannot be removed from the lid without extreme force. The filter element includes a ring of filter media having ends potted in cup shaped end caps. The lid includes a central hub that is inserted through the opening in on of the end caps and ultrasonically deformed or flared radially outward to provide a lip that engages the top end cap for axial retention. The filter element is free floating and can be moved or tilted a small degree axially and can also be freely rotated relative to the lid.

Abstract: A fuel filter cartridge assembly employs a two piece housing to house a replaceable filter unit. The filter cartridge assembly incorporates a key system to ensure compatibility of a replacement filter unit for a given cartridge assembly. Keys formed on the filter unit cooperate with keyways formed in the housing to ensure that only filter units having key structures may be used. Each key may have a different angular position, angular dimension and radial projection. By varying the dimensions of the keys and/or the positions and/or the number of keys, a composite compatibility matrix comprising an infinite number of configuration sets are available to differentiate between filter units having differing flow capacities, filter media, disposal options or other characteristics.

Abstract: Liquid filter arrangement with interchangeable filter element and including a pot-like filter housing in which the filter element is disassemblably inserted between a liquid inlet to the chamber and an outlet situated below, in the lower section of the filter housing, for filtered liquid from the chamber. In the liquid chamber is arranged a central tube about which is arranged the filter element which is provided at the bottom with an annular end piece sealingly surrounding the central tube, and is provided upwards with an end disc by which the filter element is fastened to a lid fastened sealingly in the upper section of the filter housing. When the filter element is in its fitted position, the end piece blocks the inlet to a draining duct in the central tube, which duct leads to a draining outlet from the chamber.

Abstract: A suction strainer includes a hollow internal core tube and an external filtering surface built around the internal core tube. A plurality of openings are defined through the side wall of the internal core tube core. In some cases the openings through the side wall are constructed and arranged such that there is somewhat less open area near the downstream end than the upstream end of the internal core tube, and the amount of open area tapers between the upstream end and the downstream end. As a result, when liquid is drawn into the internal core tube through the plurality of openings, a substantially uniform inflow distribution may be defined along substantially the entire length of the internal core tube. The internal core tube functions as a rigid structural support for the external filtering surface, enabling the apparatus to withstand post-LOCA hydrodynamic forces.

Abstract: A recharge and filter assembly includes a housing with a removable recharge and filter cartridge. The housing includes a canister with a removable cover allowing access to the cartridge. The cartridge includes a filter element comprising a ring of media and upper and lower end caps. The upper end cap carries a peripheral seal which provides a fluid-tight seal with the housing canister. An annular channel is provided between an annular portion of the upper end cap and the seal. An annular support member from the cover is received in the annular channel to support the upper end cap. Latching fingers on the upper end cap and a mating ring on the cover removably couple the cartridge to the cover. The cartridge further includes a recharge canister supported by tabs on the upper and lower end caps. Fluid is recharged by inhibitor material, while particulates and other contaminants are removed by the filter media.

Abstract: A fuel filter cartridge assembly employs a two piece housing to house a disposable, incineratable filter unit. The filter unit is constructed to cooperate with the sealing mechanism of the housing to seal the assembled cartridge against a fuel inlet/outlet conduit. Tabs formed on the filter unit end cap cooperate with slots formed in the housing to ensure that only compatible filter units are used.

Abstract: Provided are a filtration apparatus for a polycarbonate comprising a filtration container, a flange plate, one or more leaf disc-type filters, a filter press and a center pole having an integral construction with the filter press as constituting elements, these components having specific structures, and a process for manufacturing a polycarbonate using the filtration apparatus. Foreign materials are effectively removed by using the polymer filter, and at the same time, discoloring, crosslinking and gel formation, which would occur in the filter, are suppressed; and as a result, a polycarbonate having excellent quality can be manufactured.

Abstract: A filtering device comprising a pressure vessel provided with a feed connection and a filtrate connection, and one or more capillary filtration membrane modules. The membrane modules comprise an inlet coupled with the feed connection, an outlet coupled with the filtrate connection, and a filter housing provided with a membrane compartment accommodating a bundle of capillary filtration membranes. The capillary filtration membranes are cased at both ends of the membrane module in membrane holders. At least one of the membrane modules is provided with at least one feed-through conduit extending substantially in the longitudinal direction through the membrane module.

Abstract: A filter cartridge for use with a base to create a filter assembly. The filter cartridge includes a seal to establish a fluid flow within the filter assembly and a resilient bias member to bias the filter cartridge away from the base. The resilient bias member in cooperation with a fastening mechanism secures the filter cartridge to the base.

Abstract: A filter for filtering liquids, especially fuel, which includes a concentric housing, an unfiltered liquid inlet, and filtered fluid outlet, and a backflow member. A concentric filter element, with a dirt collecting chamber in the lowermost part thereof, is disposed in the housing, which is closed with a cover. The housing also contains a riser pipe having a return bore hole in the uppermost part thereof, as well as a return pipe. An intermediate pipe, which is sealingly closed by the cover, is disposed above the riser pipe, and the filter element is removably attached to the intermediate pipe.

Abstract: The invention provides, in combination with a swimming pool cleaning device comprising an outer shell with a detachable lid, the outer shell being open at its lower end, and an inner shell spaced apart therefrom, open at its upper end and accommodating an impeller and a clean-water exit tube, the improvement comprising a filter element having a basket-like shape including a tubular central stem configured to be seated on the exit tube, the central stem being surrounded by an annular trough constituting the active filtering portion of the element, with the outer rim of the trough being detachably affixed to the inner shell, wherein, during operation of the device, solids-entraining water drawn by the impeller enters the annular trough from above and, passing the active filtering portion, emerges therefrom as clean water to be expelled through the exit tube and returned to the pool.

Abstract: Several filter elements (13, 14) for purifying a liquid are connected with a connecting piece (21) to form a single structural unit which is then arranged in a filter housing (12). One of the advantages of the invention is that the filter elements (13, 14) can be connected before they are introduced into the filter housing (12). This makes the final assembly of the complete filter (11) considerably easier by reducing the number of parts. The connecting piece (21) can also be used to separate a flow of liquid into two partial flows which can be filtered through different filter elements so that they differ in their degree of purity.

Abstract: A filter cartridge for use with a base to create a filter assembly. The filter cartridge includes a seal to establish a fluid flow within the filter assembly and a resilient bias member to bias the filter cartridge away from the base. The resilient bias member in cooperation with a fastening mechanism secures the filter cartridge to the base.

Abstract: A filter element (15) for filtering a liquid or gaseous medium including a pleated filter (16) of paper or non-woven fabric, and end plates (17, 18) on end faces of the filter element, with the end plates preferably being made of thermoplastic synthetic resin material, at least one of the end plates carrying a sealing element (19, 25, 27, 28) which is connected to the end plate by at least two lateral surfaces (20, 21).

Abstract: A water filter is packaged in a way that permits longer dwell time and greater volume in a dwell passage of the water filter. In one embodiment the water filter includes an influent passage where a biocide is imparted to the water, a dwell passage where the water remains in contact with the biocide for at least a predetermined duration, and an effluent passage where the biocide is removed from the water. The water filter includes a replaceable cartridge mounted in a pressure vessel. By arranging the dwell passage to include a pan shaped portion in the bottom of the vessel and an axial portion along the extremity of the cartridge, greater volume, greater mixing, and more effective disinfecting result. Another embodiment includes a series of baffles on the exterior surface of the cartridge that create further turbulence for mixing the biocide with the water.