…appliances from corrosion. This unique formula also attacks existing hardness scale, forms a thin preventative coating on the inside of pipes and other metallic surfaces and reduces the leaching of copper and lead into drinking water. The system sequesters hard water, reducing scale buildup, and also sequesters low levels of iron, reducing rust staining. Regular use restores pressure in faucets and showerheads. This product is a refill cartridge for the scale and corrosion system. It’s a simple and smart way to defend against hard water buildup in pipes and appliances….