The AP430SS Hot Water System Protector is one of the most popular domestic water purifying systems, particular for households fraught with hard water. This water system provides impressive descaling—ideal for households facing the nuisance of hard water salts. Scaling is known to reduce the life of kitchen appliances and plumbing networks apart from contributing to blockage and bursting problems—often seen in kitchen and bathroom fixtures. The purifier is also good for long-term usage as it releases a Food Grade Chemical (USDA approved) that prevents scaling of exposed metal parts. This hot water system protector is effective for all types of water systems, including boilers, tank-less, and tank-type (electric and gas). It comes with a standard AP431 cartridge.