130mm diameter- to fit various canister filters.
Use the RowaSponge to effectively control the growth of nuisance algae in both fresh water and marine tanks. This product combines the proven performance of RowaPhos with RowaCarbon, in one convenient and easy to use product! The RowaSponge will help remove organics from your aquarium system, reducing yellowing of the water. The new RowaSponge is designed to fit directly into Jewel and canister filters. Two shapes are available, round for canisters and square for Jewel filters. The square shaped RowaSponge is available in two sizes and all of the RowaSponges are supplied in packs of 5. Use the RowaSponge in conjunction with a phosphate test kit to keep your PO4 levels down. The RowaSponge also removes SiO2.
RowaSponge Large Round Sponges Pack of 5 Reviews 
