We designed the 3M™ Whole House Scale Inhibition Water Treatment System AP430SS to reduce scale build-up on hot water-using appliances such as water heaters (standard and tank-less), clothes washers and dishwashing machines, and on plumbing fixtures like faucets, pipes, and shower heads. The AP430SS provides unrestricted flow of up to 10 gpm with ¾” NPT inlet/outlet connections.The overall design of the scale inhibition system makes the installation and cartridge change-out easy for professionals. The 3M™ AP430SS Whole House Scale Inhibition Water Treatment System should be installed on the cold water supply line of the water heater or at point-of-entry of water into the home or light commercial application. The scale inhibition system helps extend the life of downstream water-using appliances such as water heaters (standard and tank-less), clothes washers and dishwashing machines, as well as plumbing fixtures like faucets, pipes and shower heads by reducing scale build-up and corrosion.