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UND504 |
Undergravel filter 9" 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
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