Undergravel filter for aquariums that uses interlocking grid plates and an airlift system to draw water through the substrate, which acts as the filtration medium to remove impurities and nourish plants. It's a biofilter that cleans the substrate continuously from fish waste and plant debris. You can add as many of these as you need, in order to cover the bottom of your aquarium.

Key Features:

• Undergravel Filter:

  Water is pulled from the aquarium through the substrate (like sand or gravel). 

Grid Plates and Riser Tube:

• This listing includes 3 interlocking grids, each one measuring 5.5" x 11", one telescopic riser tube, airline tubing and one air stone. 

Airlift System:

• An airlift tube draws water up through the filter, creating suction to pull water down through the substrate. 

Biofiltration:

• The filter's design promotes beneficial bacteria to grow in the substrate, which helps to break down organic waste. 

Nourishes Plants:

• Impurities drawn into the substrate can also be used by plants, making it a suitable system for planted aquariums.