Feature: 1. HIGH DENSITY FINE SPONGE: Aquarium air filter uses high density porous fine sponges to prevent juvenile fish from being sucked into the sponge filter. 2. 5 LAYERS OF SPONGE: Aquarium sponge filter uses 5 layers of sponges to provide more surface area for the growth of beneficial microscopic organisms. 3. ABSORBS FINE PARTICLES: Fish tank bio sponge filter attracts floating debris and fine particles, keeping the tank water closer to natural water quality. 4. EASY TO CLEAN: Bio sponge filter is easy to clean, simply remove the sponge, rinse and place it back into the tank water, weekly cleaning of the sponge is recommended. 5. EASY TO INSTALL: Biochemical water filter is easy to set up and install and provides a good flow of water, allowing the water to be fully oxygenated and heated. Specification: Item Type: Aquarium Air Filter Material: Biological Sponge, Plastic Use: Fish Tank Filtration. Package List: 1 x Filter Cotton1 x Suction Cup Note: Easy to set up, can connect an air pump and connection tube (not included), just connect the connection tube to the air pump and then connect it to the air inlet, can provide good water flow, both filtration and aeration, but also can make the water fully oxygenated and heated.