Marketing InformationThe North Star NSDW500 Dual Stage Filtration System is the perfect choice for residential homes. With NSF certification ensuring advanced contaminant reduction, this system reduces harmful contaminants like Lead, Cysts, and much more, delivering healthier, great-tasting water to refrigerators and any sink in the home. And there''''s more: the North Star company''''s U.S.-based customer service team is ready to assist with any future inquiries or needs, and its water treatment systems draw on 100 years of experience.