The Watts Premier 531417 RO Pure Plus 4 Stage Reverse Osmosis System offers advanced water filtration compared to the Watts Premier 531411 RO Pure RO-4 Reverse Osmosis System. This space-saving system features a compact, under-sink design and a three gallon storage tank so you have enough water for daily use. Replacing your water filter is literally as easy as pushing a button! These quick-change filters, as well as the built-in check-valves that are installed in the manifold, means no more messy or fussy change-outs like other traditional reverse osmosis system model. Getting a tap for delicious and safe water has never been easier. 

This Complete Reverse Osmosis Under-Sink System, includes everything you need to get safe, delicious drinking water right from the tap, including all installation fittings and tubing, a 3 gallon storage tank and shut-off valve, the 4-stage filtration system (including all four filters), and a Watts Brushed Nickel Air Gap Faucet!     Features:
WQA Certified The WQA Gold Seal ensures that this product is constructed of safe materials, and reduction claims are tested. 

Compact Design The Watts Premier RO Pure Plus Reverse Osmosis System has a compact design that fits conveniently under your sink. 

Easy Installation This system uses quick change push-button filters, eliminating the mess and difficulty of  changing your filters. 

Four Stages of Advanced Filtration. The Watts Premier Reverse Osmosis System's four stages of filtration reduces sediment, particulate, chlorine, taste and odor, sodium, chromium, arsenic, copper, lead, cysts, giardia, VOCs, MTBEs, cryptosporium, atrazine, benzene, lindane and many other contaminants from your water.  

Special Carbon Block VOC Post Filter For Added Security. The Watts Premier RO Pure Plus Reverse Osmosis System includes a carbon block post filter which is used for the reduction of VOCs, which include herbicides, pesticides and THMs.  

NOTE: This product will NOT fit the Watts 1/4 Turn KWIK Change Filter System.