Abstract: A bag filter assembly utilizing a conventional housing and end cap construction includes a unique filter bag retaining cage and end cap adaptor which allow the use of replaceable bag filter elements of widely varying construction. The assembly will accommodate bag filter elements of the type having a shape retaining opening of rigid construction and including a shape-retaining bottom end cap or of the type comprising a generally continuous flexible tubular sleeve. The system is tolerant of the latter type of bag filters of substantially varying thicknesses.

Abstract: A faucet-attached filter apparatus for filtering drinking water includes a unitary filter cartridge subassembly which provides a housing for the filter media, inlet and outlet porous media retainers, the filtered water outlet passage, and a quarter-turn connector with seal for simple cartridge insertion and removal from the filter housing.

Abstract: A pour-through pitcher filter assembly includes a compact filter element including a thin annular disk of molded activated carbon and a peripheral annular seal element. The seal element allows the filter to be replaceably mounted in the lower end of a plastic reservoir, which reservoir is adapted to be supported in the top of a pitcher for receiving filtered water. The reservoir may be made by a blow molding process and includes an integral bellows member which is manually collapsible to pressurize the interior of the reservoir to initiate gravity flow through an initially dry filter element. The seal element utilizes a synthetic rubber material and is preferably insert molded around the carbon filter disk.

Abstract: A portable water treatment apparatus utilizing a cylindrical filter module having a spirally wound semipermeable membrane assembly includes interior upper and lower O-ring seals and an outer brine seal, all of which may be assembled without any potentially damaging movement between the seals and the respective interfacing surfaces in contact with the seals. Each of the O-ring seals is disposed between an annular shoulder on one interfacing part and a frustoconical surface on the other part such that a sealing compression is the only movement imposed on the O-ring. The brine seal, comprising a strip of adhesive-coated tape, is attached after the filter module has been placed in the housing such that it is in its final sealing position and is undisturbed by any subsequent assembly step.

Abstract: Synergically stabilized mixed form halogenated and/or interhalogenated forms of the freebase polyvinyl-pyridine resin for disinfecting water. The resins may be employed in a single pass column or bed system to provide instantaneous disinfection of bacterially contaminated water.