This Water Treatment System by Scaltrol can be fitted on cold water lines. The most popular applications are: Food Service: dish machines, ice makers, steamers, combi-ovens, booster heaters, coffee makers Commercial: pressure washers, water heaters, laundry machines, medical sterilizers, farms, hospitals, schools, detention facilities, club houses Residential: whole house, water heaters, dishwashers, washing machines showers/bathtubs, toilets Replacement cartridge available: RSC-50