Lee's Undergravel Filter is the key to providing a strong biological filtration system. Undergravel filters utilize your tank's gravel substrate as a filtering surface area while providing oxygen to help aerate your aquarium water.
Placed on the bottom surface of the aquarium, the filter plates utilize the gravel bed as a source of surface area and provide oxygen by recirculating the water down through the media and up through the uplift tubes.
Attach these undergravel filters to an Air Pump or Powerhead - Sold Separately
Trouble-free Biological Under Gravel Filter designed with adjustable 1" uplift tubes for better water circulation. Multiple plate construction for easy installation.
Advanced design allows separate plate installation and features optional flow-thru set-up which can be used with a power head. Made of special quality plastic which resists splitting and cracking.