The Unicel C-7470 Replacement Filter Cartridge is designed to provide efficient and reliable filtration for your pool. This cartridge is specifically designed for use with the Clean & Clear Plus filtration system. With a 4 pack quantity, you'll have plenty of replacement cartridges to keep your pool water clean and clear. The Unicel C-7470 Replacement Filter Cartridge is a high-quality and durable option for maintaining the cleanliness of your pool water.