BAZHOU Type S1 Filter Cartridge Sponge for Compatible, Reusable Washable S1 Type Hot Tub Foam Filter Cartridge EFFICIENT: Made of premium Dacron fiber material, sturdy and durable.Foam filter will outlast your paper cartridges. SAVE COST: For your pool and regular replacement of the cartridge can prove costly. These washable and re-usable foam filters will reduce your costs. WASHABLE REUSABLE: This foam filter can survive in the carton and can be washed and reused multiple times. It is recommended to replace one carton per week. Service life could be affected by power of your filter, water temperature, and probably if cleaners are used. NOTE: Please you remove the filter when you impact the electrode rod, as excessive chlorination will cause the foam to rupture quickly. Normal levels of chlorine and bromine disinfection are good and these foams have been tested at normal levels. color: blue Size: 10.8*7.3cm Quantity: 2pcs 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding. 3. Only the above package contents, excluding other products.