SPECIFICATIONS: This ultra low pressure replacement reverse osmosis membrane has a 99.4% salt rejection rate, a recommended NaCl of 1,500 ppm, feed spacer size of 28 mm, a maximum operating pressure of 600 PSI, and an average permeate rate of 2,400 GPD @ 150 psi QUALITY REPLACEMENT: SP-UL4040 is a compatible alternative replacement element for ULP-4040, TMG10D, LE-4040, ESPA2-4040, LG BW 4040 ES, and LE1-4040 industrial RO membranes NSF CERTIFIED: SpiroPure commercial RO membranes are NSF 61 certified (2024). Each low energy membrane provides 0.0001 micron reverse osmosis filtration OUTSTANDING FILTRATION: Ultra low energy elements are an excellent choice for treatment of municipal water, groundwater, surface water, production of bottled water, drinking water, boiler replenishment water, ultrapure water, and more. EASY INSTALL: Our universal size 4 x 40 membranes are easy to install and maintain, with a tight seal that will not deform or leak SpiroPure SP-UL4040 Ultra Low Pressure 4x40 Industrial RO Membrane Element is NSF/ANSI 61 certified. Ultra Low Energy membranes are a great choice for municipal water, groundwater, surface water, ultrapure water production, and more. Ultra low pressure, low energy reverse osmosis membrane easy to install and maintain.