Abstract: A filter assembly, particularly for use with a plastic bottle having an open neck with an inside diameter of about 50 mm or less (e.g. about 25 mm), includes a tube of filtering material connected to one surface of a cap while a valve extends from an opposite surface of the cap. The tube is preferably of filtering material such as activated carbon with plastic binder, having a substantially continuous liquid-porous sidewall, a hollow interior, a first closed end, and a second open end. The tube is operatively connected to the cap second surface at the tube second open end by sonic welding, a mechanical connection, or adhesively. The cap has a fitting portion for cooperating with the bottle neck, such as internal screw threads or a snap portion. The valve may be a reciprocating valve, a baby bottle nipple, or a spray device. A biocidal medium may be disposed within the hollow interior of the filter tube, and the tube may be wrapped with a filter material having a pore size of about 1-4 microns.

Abstract: A filter assembly, particularly for use with a plastic bottle having an open neck with an inside diameter of about 50 mm or less (e.g. about 25 mm), includes a tube of filtering material connected to one surface of a cap while a valve extends from an opposite surface of the cap. The tube is preferably of filtering material such as activated carbon with plastic binder, having a substantially continuous liquid-porous sidewall, a hollow interior, a first closed end, and a second open end. The tube is operatively connected to the cap second surface at the tube second open end by sonic welding, a mechanical connection, or adhesively. The cap has a fitting portion for cooperating with the bottle neck, such as internal screw threads or a snap portion. The valve may be a reciprocating valve, a baby bottle nipple, or a spray device. A biocidal medium may be disposed within the hollow interior of the filter tube, and the tube may be wrapped with a filter material having a pore size of about 1-4 microns.

Abstract: A detent and numerical indicia are associated with a cap for a water treatment apparatus to keep track of how many times a bottle in which the treatment apparatus is disposed has been filled and emptied, to provide for periodic replacement of the filter media. The treatment apparatus is for attachment to a bottle with an opening at a neck portion, and includes an elongated tube, a cartridge containing water treatment media connected to one end of the tube, and a cap for capping the other end of the tube. The cap includes a body having through-extending passages therein, and a top which is movable with respect to the body to selectively cover or uncover the passageways. A detent is associated with the cap body and the top for providing detented rotation of the top with respect to the body. Indicia are associated with the cap top and the cap body for indicating each detented position.