I set up my RO system yesterday which is a 75 GPD unit & have a 3.5 Bar working pressure at the membrane. My incomming TDS reading is around 600 and after the membrane it is about 40 at the moment. I did turn off the system overnight as I dont yet have my auto shut off valve fitted. What should the output TDS be? bearing in mind my water is around 600. When i initially set the system up it was reading 300 on the output and is slowly decreasing, But what should it get to?
