Algarde Undergravel Aquarium Filter 8.5" X 17"

Algarde Undergravel aquarium filter 8.5" x 17"

Includes air stone, uplift and air line.

When the air-lift, which is attached to the undergravel filter is operating, the air rising, which is provided by means of an air pump (air pump not included with this product- needs to be purchased separately) in the tube, lifts the water upwards with it from underneath the gravel, and a circulation of water is created.

The water in the aquarium is drawn downwards and filtered through the gravel into the filter plate and is then expelled by the air-lift towards the surface of the water