Bestway® Filter Cartridge (Twin Pack) comes with two replacement water filter cartridges for 530/800 gal/hr filter pump systems. It's vital that you replace your pool cartridge on a regular basis. It's likely that your Bestway® pool will be used daily during periods of sunny weather. The more an above ground swimming pool is used, the quicker a filter cartridge becomes blocked with dirt and debris. Bestway® Type II filters are very easy to fit into a 530/800gal filter pump. They take no time at all to rinse out and clean, which is great if you have a busy schedule and important for the upkeep of healthy pool water. However, cleaning an above ground pool filter will only work for so long before it becomes untenable. As a result it's recommended that your cartridge filter is changed every two weeks during periods of prolonged use. If you're unsure whether the Bestway® Filter Cartridge (Twin Pack) is compatible with your pump, don't hesitate to look at your filter pump manual. The Type II filter cartridge is just one of the models in the Bestway® Pool Accessories collection. You'll also find filter pumps, cleaning gear and a variety of other products to enhance your Bestway® Above Ground Pool.