Cascade Hang On Filter 100 Bio-Sponge

Penn Plax Cascade 100 GPH Bio Sponge Replacement Bio Sponge for the Cascade Hang On 100 power filters. Penn Plax Cascade 100 GHP Bio Sponge is ideal for housing beneficial bacteria for superior biological filtration. Product Features Replacement Bio Sponge Suits Cascade Hang On 100 power filters Grows beneficial bacteria for superior biological filtration Contains 1 replacement sponge Shop more aquarium filter media and parts here.