Ro Solution’s  Reverse Osmosis®/Ultrafiltration systems are revolutionary breakthrough in the reverse osmosis and Ultrafiltration  industry. Through years of experience, research have produced totally new most effective, healthiest Reverse Osmosis/Ultrafiltration systems in today market. Undersink reverse osmosis units are available at  11 to 17 stages – the number varying with model of Reverse Osmosis/Ultrafiltration system. Reverse Osmosis/Ultrafiltration systems produce up to 100  gallons of top quality water per day and remove up to 99.9% of undesirable contaminants and filter particles as small as 1/10,000 of a micron by forcing untreated water through a semi-permeable membrane. Pressure forces the water to flow in the reverse direction to the direction of flow in natural osmosis. Our Reverse Osmosis/Ultrafiltration systems have compact designs that can easily fit beneath the kitchen sink. Supplied with a complete installation kit that includes a European lead-free long-reach designer faucet,  4 gallons steel pressurized holding tank with a polypropylene inner liner  and a 3.2 gallon capacity, all interconnecting color-coded tubing, filter cartridges, Ultrafiltration membrane, RO membrane, and installation hardware for easy installation. When considering installation of an undersink unit: if current under sink plumbing is hard copper tubing the saddle valve would be used; for flex tubing the T-valve would be required.  During the ordering process you will have a choice of which installation valve you prefer. The influent waters psi will have a direct affect on GPD or gallon per day production.  The RO is designed to work in a psi range from 35-60 with 60 being optimum.  If your water pressure is low or you have a high TDS please consider a system manufactured with a pump. Units are manufactured standard with 110v electrical outlet but are also available in 220v if requested.