Aquapapa Filter Media Bags 50 1″ Bio Sponge Ball + 1 lb Ceramic Rings for Aquarium Fish Tank Pond Canister Filter (Ship from CA USA) Price: $10.60 (as of 30/09/2020 19:31 PST- Details) & FREE Shipping.

Bio ceramic rings are used to keep your bacteria colony to convert ammonia from waste to nitrites and nitrites to nitrates.
Bio balls work as a biological filter media and give a home for beneficial bacteria where they can settle and be fed by water and oxygen. They promote gas exchange and increase dissolved oxygen levels.
Good to use in both fresh & saltwater tank; offers mechanical and biological filtration with inside sponge.

In stock on September 18, 2020. Order it now.