Series PWR4011 Reverse Osmosis (RO) Systems are commercial grade low-energy RO units for the reduction of total dissolved solids from water. They are designed to supply reverse osmosis quality water with production rates ranging from 1,800 to 5,400 gallons per day. These units are designed for wall mount installations. Reverse osmosis is a process where high-pressure feed water is fed into a semi-permeable membrane. In the membrane, pure water is allowed to pass through the membrane material and exit as purified permeate water. Dissolved mineral salts are not allowed to pass through the membrane and become a concentrated reject stream that is sent to a rain. These RO systems use low-energy membranes to achieve a minimum average NaCl ionic rejection of 95 percent. Includes 10-in. high flow per-filter. Other features include: stainless steel high-pressure piping, 304 stainless steel wall mounted support frame, 316L stainless steel 300 psi high-pressure membrane housings, pressure gauges for pre-filter inlet/outlet and membrane feed pressure, low feed water pressure safety switch, microprocessor based controller with delayed auto restart after low-pressure shut down, tank level and pretreatment interlock inputs, permeate and reject water flow meters, adjustable reject and reject recycle valves, permeate check valve, and automatic inlet solenoid valve.Flow Rates: Up to 5,400 gallons per day (20,439 lpd)