Product Features iSpring 7-Stage Reverse Osmosis water filtration for clear water. Certified against NSF 58, this under sink mounted water filter and Point-of-use water softener contains 7 different stages of filtration, it removes up to 99% of over 1,000 contaminants, including lead (removes up to 98% of lead), chlorine, fluoride, arsenic, asbestos, calcium, and sodium. With its advanced 11 watt UV stage, the RCC7AK-UV is a suitable option to filtering well water and other problem water sources like water from lakes and streams. Our unique flow sensor switch turns the UV unit on and off automatically with water flow, saving power and lengthening the life of the UV lamp. Reverse Osmosis (RO) removes not only harmful pollutants but also a few helpful minerals. The Alkaline Remineralization (AK) filter restores healthy minerals and a natural alkaline balance, also producing a more natural taste that comes from the presence of the right balance of these minerals. Quality components ensure reliability and low maintenance for many years to come. Clear see-through 1st stage housing makes filter inspection a snap. Feed Water pH - 3.0 -11.0. Feed Water Pressure - 45-70 psi. Feed Water Temperature- 40-100 F (4 - 38 C) Do-It-Yourself installation, typically in a couple of hours with industry-leading help just a phone call away. Fits under a standard kitchen sink, with all parts included and clear, well-organized instructions and videos. For leak-free installation, simply push tubing ? inch deep into quick-fitting connectors and lock - no threading pipes needed. Features European-designed brushed nickel all-metal faucet. RCC7AK-UV Performance The RCC7AK-UV is a multi-layered filter system that removes over 1,000 different types of contaminants, including arsenic, asbestos, chlorine, fluoride, lead, mercury, sodium, and more. It features an extra UV ultraviolet stage. Though not usually necessary with municipal-treated water, this stage is particularly important in treating water from wells, streams, lakes and other natural water sources. The filtration system consists of 7 processing stages, each one designed to progressively remove contaminants and improve water quality: 3 Pre-filters: PP sediment filter. Carbon KDF (GAC) filter. Carbon block (CTO) filter. They remove large contaminants like sediment, chlorine and chloramines. The heart of the system is the Reverse Osmosis (RO) filter that removes contaminants down to 0.0001 microns ? so small that only water molecules can squeeze through but virtually nothing else. Fine GAC filter provides final polishing before the filtered water is delivered to the faucet. An Alkaline Remineralization filter restores healthy minerals and a natural alkaline balance. The end result is bottled-water quality.