1.Fine Sponge Filtration: The mini nano biochemical sponge filter provide mechanical and bio filtration and traps debris or waste without sucking up your fish, keeping a crystal-clear water tank. 2.Easy to set up & clean: simply install an airline into the unit and turn on the air pump, simply rinse and squeeze sponge in tank water. 3. Quiet environment: This mini nano biochemical sponge filter creates a gentle flow without causing disturbance to you or your fish. 4.Safe for fish: soft sponge material, traps floating debris and won't suck up your fish.