Description: Changing your paper filter cartridge is part of your routine maintenance for your pool and regular replacement of the cartridge can be expensive. These washable and reusable foam filters will reduce your costs. The initial cost of this cartridge is slightly higher than that of a paper cartridge, but the foam filter is washable and reusable, it lasts longer than a cartridge.Advised to change a paper cartridge each week, while these foams can simply be washed and put back. One foam filter lasts about 2 months.Specification:Item Type: Sponge FilterColor: Sky-blueMaterial: SpongeProduct Size: 20.0 * 10.0 * 10.0 cm / 7.9 * 3.9 * 3.9 inchPierced Central Hole: Approx.40mmQTY: 1pcNote: Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting.Thank you for your understanding, nice day!Package Includes:1 x Sponge Filter