The North Star NSTAS35 Scale Defender is the eco-friendly choice to reduce scale build up in residential homes with low levels of hardness in their water. Advanced technology converts hardness minerals to a microscopic crystalline form, which helps them avoid sticking to plumbing, appliances, and fixtures. Scale Defender does not remove any minerals, so it doesn''''t require a drain for discharge, making it eco-conscious and virtually maintenance-free. North Star''''s 100 years of expertise in water treatment will ensure top-notch performance and a responsive, U.S.-based customer service team, will offer reliable assistance for any inquiries or needs.