These are top quality membranes made from TFC film. We have tested them ourselves and the total dissolved solid readings were - Input water TDS 240, Output water TDS 7. WHY ARE THEY SO SENSIBLY PRICES?We are the direct importers, dealing with the manufacturer buying huge quantities. INFORMATION: The 1812-sized residential membrane elements are mainly applicable to various small-sized systems, such as household reverse osmosis water purifier and other water purifying devices in hospital and laboratory. The membranes are suitable for the desalting treatment of those water sources with salt concentration lower than 2000 ppm, such as surface water, underground water, tap water and municipal water, etc., ULP series are mainly applicable to numerous applications of various sizes, such as pure water, boiler water replenishment, foodstuff processing, and pharmaceutical production, etc. EXTREME OPERATION CONDITIONS - Max. Working Pressure: 300psi(2.07Mpa) - Max. Feed Water Temperature~: 45C - Max. Feedwater SDI: 5 - Free Chlorine Concentration of Feedwater: <0.1ppm - pH Range of Feedwater during Continuous Operation: 3~10 - pH Range of Feedwater during Chemical Cleaning: 2~12 - Max. Pressure Drop of Single Membrane Element: 10psi
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