Waterway 325 SqFt Crystal Water Cartridge FilterThe Waterway 570 0325 07 Crystal Water Cartridge Filter is the ideal choice for new or replacement installations, offering exceptional performance and easy maintenance. Its unique design features 2 1 2" internal piping that improves flow and reduces system noise, whether you're using 2 1 2", 2", or 1 1 2" plumbing. With four high quality cartridge elements, this filter ensures your water stays crystal clear and clean, making it a top choice for anyone