Description Under Gravel Filter 47” x 11″ Undergravel filters work by the bubbles from the aquarium airpump pushing water up the uplift tube or a power head pulling water up forcing water through the gravel to replace it so filtering the aquarium water. Will fit a aquarium up to 48 inches long and 12 inches wide. Airpump required (not supplied) Be sure to check our INFORMATION CENTER for our latest Aquarium Blog on Cleaning your Aquarium & Fish Tank. Don’t forget to check out our Facebook Page for latest aquarium blogs, coupons & news!
