Reusable Washable Filter: Changing your paper filter cartridge is part of your routine maintenance for your pool and replacing the cartridge regularly can be costly. These washable and reusable foam filters will reduce your costs. Long Runtime: The initial cost of this cartridge is slightly more than a paper cartridge but will last longer than a paper cartridge. Durable: This foam filter will last longer than your paper cartridges and can be washed and reused multiple times. Reusable and Washable: It is advisable to change a paper cartridge every week, while these foams can simply be washed and replaced. Keep Water Clean: Will be a great water cleaner for the pool. You should see a foam filter last about 2 months.