US 5,637,214 · Granted 1997-06-10

Filter assembly for water treatment apparatus

A filter assembly adapted to be used in a water treatment apparatus for removing impurities from tap water provided to residential users, having a filter housing with an opening formed therein, a filter bag composed of a porous material disposed in the filter housing, filter media contained in the filter bag, and a lid adapted to cover the opening of the filter housing. The filter housing has an upper end and a lower end each having a plurality of apertures formed therein. The filter media contained in the filter bag is composed of individual particles having a mean diameter large enough to prevent the particles from passing through the porous material of the filter bag. The apertures formed in the lower end of the filter housing may comprise elongate slots, and the mean diameter of the individual particles of the filter media may be less than the width of the elongate slots formed in the lower end of the filter housing. The lower end of the filter housing may comprise an annular portion and a central portion which extends upwardly from the annular portion, and the upwardly extending central portion may maintain the filter bag out of contact with the annular portion so as to form an annular chamber substantially unobstructed by the filter bag.

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