LTWHOME Bio Sponge Fit for Penn Plax Cascade 300 Internal Filter Replacement Cartridges(Pack of 12) Packing include: 12 pcs fine

Packing include: 12 pcs fine and 3 pc coarse filter pad

18 inches(Inner hole Diameter)

Catch debris and provide efficient water flow with less clogging for long lasting filtration

Custom designed and manufactured for the Fluval 204

Medium Foam x 1

LTWHOME Bio Sponge Fit for Penn Plax Cascade 300 Internal Filter Replacement Cartridges(Pack of 12) Packing include: 12 pcs finePacking include: 12pcs bio sponge Change every 3 4 weeks Custom designed and manufactured for Penn Plax Cascade 300 Internal Filter Optimizes the colonization of beneficial aerobic bacteria removes ammonia and nitrites keeping your aquarium clean and healthy This is not a Penn Plax product and is not covered under any Penn Plax manufacturer's warranty. The Penn Plax brand names and logos are the registered trademarks of their respective owners. Any