Sponge

Mechanical Filtration: Provides Excellent Filtering Effect While Oxygenating The Water Biological Filtration: Foam Material Supports The Colonization Of Bacteria Can Be Used With Either An Air Pump Or Any External Filter Silent Operation By Reducing Air P

Replacement foam filter for the Lee's Dual Action Foam Filter-Triangle . Provides mechanical filtration by removing fish waste and debris and a surface area for beneficial biological bacteria, which aids biological filtration. For more information, please

Ista Mechanical And Biological Filtration: Used W/ Air Pump Or External Filter