sScalewatcher Whole House Electronic Descaler and Anti-Rust Water Treatment System is a compact, computerized electronic water conditioner that will descale your homes existing plumbing, prevent new scale from forming and save you money from the moment it is installed. The Scalewatcher technology treats water in pipes with magnetic and electric field which results in mineral crystallization that will not easily adhere to pipe walls or plumbing fixtures. The treated water remains chemically unchanged therefore will retain the beneficial and healthy minerals like calcium and magnesium.