4pcs Small Aquarium Bio Sponge Filter, Up to 5 Gallon | With Suction Cups, Check Valves, For 5 Gal, 10 Gal, 20 Gal, Breeding Fry Betta Shrimp Fish Tank
Sponge filter provide both mechanical and biological filtration
Easy top set up & clean: simply install an airline into the unit and turn on the air pump, simply rinse and squeeze sponge in tank water
Using an air hose, connect one end to you air pump and the other end to this filter,and equipped with a check valve on air hose, to prevent water backflow and air pump damage due to power outage. It is a great way to clean and oxygenate your fish tanks.
