Filter assembly and cartridge therefor

Details Filter assembly and cartridge therefor Filter assembly and cartridge therefor

1981-09-16

1983-05-31

Hart, Charles N.

Liquid purification or separation

Structural installation

Closed circulating system

210282, 2104162, 119 5, C02F 174

Patent

active

043859895

ABSTRACT:
A novel filter assembly (10) and filter cartridge (12) therefor for use in an under-gravel filtration system in an aquarium tank (24). The filter assembly (10) includes an airlift tube (14), a filter cartridge (12) removably secured to the upper end of the airlift tube (14), and a tubular member (16) extending through the filter cartridge (12) and into the airlift tube (14). An aerator (18) disposed near the bottom of the airlift tube (14) is connected to the tubular member (16) by air tubing (19, 20). The top and bottom walls (48, 50) of the filter cartridge (12) are apertured (56, 58). When air is forced down the tubular member (16) and out the aerator (18), the rising air bubbles in the airlift tube (14) draw water up the airlift tube (14) and into the filter cartridge (12) through the openings (58) in the bottom wall (50), the water being returned to the aquarium tank (24) through the openings (56) in the top wall (48).

REFERENCES:
patent: 2935199 (1960-05-01), Willinger
patent: 3151069 (1964-09-01), Halpert
patent: 3850806 (1974-11-01), Cohen

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