Real Protection From Toxic Contaminants. World-class Environmental Water Systems water filtration and performance for the removal of chlorine, chloramine, pesticides, THMs, VOCs, obesogens, lead, cysts, rust, silt, sediment, heavy metals, fluoride, and much more. The ESSENTIAL reverse osmosis system offers real protection against dangerous contaminants, while meeting your individual preferences for taste and mineral removal. Filters chlorine, chloramine, pesticides, THMs, VOCs, obesogens, lead, cysts, rust, silt, sediment, heavy metals, fluoride, and much more. Made in the USA. (Exception: Genuine UK-made John Guest quick-connect fittings. See below.) Easy to install. Comes complete with quick-connect fittings, storage tank, tubing, and more. Genuine John Guest fittings (UK-made), the leader in food-grade quick-connect fittings. Maintenance-free for up to 1 year before filter replacement. Just change them out and go! Well Water Warning: Well water is required to have independent, complete and proper testing of your well water to determine the proper course of action in order to specify the correct system(s).