The Aqua Pure AP431 replacement cartridge has a scale inhibition system. It removes scaling from harming water equipments and pipes for the AP430SS filter. This helps extend the life of hot water systems, pipes and downstream plumbing fixtures. The 3/4" inlet/outlet connections have an unrestricted flow design. It ensures a high flow rate and easy installation. This cartridge system is ideal for any size home and light commercial use. It is designed with translucent dispenser cartridge to allow for convenient cartridge detection of remaining scale level reduction level. It has a multi-application design which is effective on all types of hot water systems. The cartridge is made of FDA CFR-21 complaint materials to help achieve a high benchmark for drinking water purification.