Hi guys. I have a RO unit with a 3 month old membrane. This weekend I setup a new tank and ran the unit for 30 hours or so. I usually get tds of 1-2 (our tap water in harties isnt very clean). By the end of the weekend the RO water was sitting at 40tds. I replaced the resin, particle filter and carbon filter and I rinsed the membrane. But now the water is at 18tds and not 1-2. Surely I couldn't have finished the RO unit so quickly?