Cascade Bio-Rings Filt-A-Pack is a convenient ready-to-use nylon mesh filter bag filled with Ceramic Rings.
Surface area and pores sized to accommodate bacteria necessary for biological balance and to remove toxic Ammonia and Nitrite.
Can be used in Penn-Plax Cascade Canister Filter, Eheim ECCO, Eheim Pro & Pro II, Aquaclear 500, FilStar Canisters and Fluval Canisters.