• Under-Gravel Filters work by drawing water from the aquarium through the gravel.
• This acts as a layer of filter media giving a huge surface area for mechanical and biological filtration.
• As a mechanical filter, it uses the air-driven system (or powerhead) to create suction, that allows the gravel to capture floating particles in the water.
• As a biological filter, harmful wastes are biologically transformed into a relatively harmless substance by aerobic bacteria that accumulates in the media and return filtered water to the aquarium.
• Whilst being known as an old-fashioned method, under-gravel filters are still popular and are regarded by many as the best form of aquarium filtration. A lot of shops are still using these in their fish rooms.

Suitable for

• Tropical, Coldwater, and Marine aquariums.

Specifications

• Each Under-Gravel Filter plate measures 11” wide.
• They are available in 17”, 23”, 29”, 35” and 47” lengths.
• Contains 1 Under-Gravel Filter plate, 1 uplift, airline and 1 air stone.
• Colour: White.