Fish Supplies

This state-of-the-art Under-Gravel Bio Filter uses biological and mechanical filtration and dual carbon inserts for superior water purification to keep your aquarium healthy. Provides uniform water flow across the entire aquarium while forcing water down into the gravel to flush out trapped particles. Made of heavy-duty injection molded plastic for easy installation and years of use.  Recommended for freshwater and saltwater aquariums. Adaptable to either 1 or 2 power heads/air pumps.

Available in 4 sizes:

For 5.5 Gallon tanks (contains two 6” x 7” under gravel plates, two raised locking tube connectors, two water flow tubes, two adjustable water flow spouts, two filters that snap into the flow spouts and two air tubes with air stones).

For 10 Gallon tanks (contains two 9-1/2” x 9-1/2” under gravel plates, two clear raised locking tube connectors, two long water flow tubes, two short water flow tubes, two clear slip ring connectors, two adjustable water flow spouts, two filters that snap into the flow spouts and two air tubes with air stones).

For 20 Gallon tanks (contains two 11-1/2” x 11-3/8” under gravel plates, two clear raised locking tube connectors, two long water flow tubes, two short water flow tubes, two clear slip ring connectors, two adjustable water flow spouts, two filters that snap into the flow spouts and two air tubes with air stones).

For 30 Gallon tanks (contains three 11-1/2” x 11-3/8” under gravel plates, two clear raised locking tube connectors, two long water flow tubes, two short water flow tubes, two clear slip ring connectors, two adjustable water flow spouts, two filters that snap into the flow spouts and two air tubes with air stones).