Watts Premier 531417 Pure Plus Reverse Osmosis Water Filter System, White REVERSE OSMOSIS WATER FILTRATION: The Watts Premier RO Pure Plus Reverse Osmosis System was designed with you in mind. With a space saving, compact design that allows this system to fit under your sink with minimal space requirements. It gives crystal clear, high quality and great tasting water RO WATER FILTER: Changing the filters is as easy as pushing a button, this RO System uses quick change filters eliminating the mess and difficulty associated with filter changes! No need to shut off the water before changing the filters! There are check valves installed in the filter lid between cartridges to prevent back-flow and shut off valves in each filter head that shuts off the water flow when cartridges are removed. Maximum operating Pressure: 100 psi EASY TO INSTALL: Watts Premier's Reverse Osmosis home water treatment systems are easy to install. All components are an integral part of the unit, requiring fewer tube connections, Back-flow prevention valves are installed between the elements. Cartridges have double o-rings so they won't leak. FOUR STAGE WATER FILTRATION: The RO Pure Plus Reverse Osmosis Filtration System uses a 4-Stage Filtration based upon 4 separate treatments. Sediment (105311), Carbon (105351), 50 GPD Membrane (105331) and Post VOC Carbon (105381), giving you crystal clear, high quality and great tasting drinking water. BEST QUALITY WATER FILTER: Includes a Brushed Nickel, Monitored, Top Mount Twist, Air-Gap Faucet and 3 gallon storage tank. Filters change out at the push of a button. This system is certified by WQA to NSF/ANSI 372 Lead Free and Certified to NSF/ANSI 58 Certified Reverse Osmosis Units.