The PCC218 Phosphate Crystal Cartridge is a specialized filtration solution for Pentair Residential Filtration systems. This 18 oz. cartridge is designed to effectively reduce phosphate levels in water, preventing algae growth and improving overall water quality. Constructed from high-quality materials, it ensures durability and long-lasting performance. The PCC218 is easy to install and compatible with various Pentair models, making it an essential component for maintaining a healthy aquatic environment. Enhance your water treatment system with this effective phosphate reduction solution.