Patent ID: 6939463

Claim:
The combination of a swimming pool, a filter, a filter container open to swimming pool water, a swimming pool water circulation system that includes a pump and piping connected to the pump, and a filter for the swimming pool water, wherein the filter includes: a filter body disposed in the filter container, such filter body having a swimming pool water inlet opening at its upper end, a water discharge opening at its lower end and auxiliary water inlet openings in its sides; a filter bag releasably arranged in the cylinder for upward removal therefrom, the filter bag having a cylindrical sheath which extends from the upper end of the filter body downwardly to the lower side of the filter body and encompasses the exterior of the filter body, such filter bag also being formed with a pocket that extends concentrically downwardly from the upper end of the sheath into the filter body from the upper end of the filter body; and piping between the filter body discharge opening and the suction end of the water circulation system pump whereby upon operation of the pump swimming pool water is continually drawn from the filter container downwardly into the water inlet opening and the auxiliary water inlet openings and then out of the water discharge opening of the filter body into the piping to be returned to the swimming pool.