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NoDarran
Why don't you have a quick google before making stupid comments?
My 4040 membrane was taking the TDS down from 220ppm to 1ppm when new its just over six years old nowand still gets it down to about 15ppm.I would say you don't have enough water pressure.
I have tap water tds of 78, after RO it is coming out at 9, is my membrane working effectively?