Under gravel aquarium filter

Liquid purification or separation – Structural installation – Closed circulating system

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Details

119 5, A01K 6300

Patent

active

042160901

ABSTRACT:
A circulating system for an aquarium is provided in which a grid is positioned within the aquarium and disposed upwardly from the bottom of the aquarium to form a chamber between the grid and the bottom of the aquarium while gravel is disposed over the top side of the grid. A novel pump is provided for pumping the aquarium water to the chamber between the bottom of the aquarium and the grid whereby waste material and debris is collected on the underside of the gravel and eliminated by natural decay or backwashing of the gravel.

REFERENCES:
patent: 3135238 (1964-06-01), Eyl
patent: 3738491 (1973-06-01), Dockery
patent: 3889639 (1975-06-01), Day et al.
patent: 4004551 (1977-01-01), Kato

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