Importance

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Abstract

A filtering system, especially for swimming pools, by which a liquid or gas may be cleansed of suspended particles by passing the liquid or gas, under a pressure differential, through a multiplicity of vertical, tubular filter grids, each of which holds an outer layer of a diatomaceous earth particles which transmits the fluid and captures the particles. Each time a filtering cycle is stopped, the diatomaceous earth particles fall from the grid units due to gravity and their interconnection in the coating layer. This prolongs the useful filtration time of the filter grid units before they need to be backwashed. The filter grid units are supported by a central manifold provided with a plurality of removable hollow arms which radially extend from a central hub, and have a plurality of threaded openings therein, spaced apart from one another along the length of the arms, for receiving respective mating threaded ends of the filter grid units and aligning them in a vertical array within the filter tank. Each of the grid units is comprised of a rigid, braided or woven sock-like pervious filter tube tightly fitted over a rigid, perforated tubular frame. This arrangement prevents the adjacent grid units from tangling and losing effectiveness and also permits quick, easy removal and/or replacement of individual filter grid units.

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First Claim