Just replaced all my ro filters and i cant get the tds down to 0. Wierd part is that its saying 0 before the membrane and 1-2 after the membrane and 2 di stages.. I had 0 tds before i changed all the filters. Even changed the battery in the tds meter. I have the filters in order, 5 mic 5mic 1 mic 0.6 mic/carbon 150 gpd membrane di and di. Checked the membrane 2x, its seated good , 55 - 60 psi around 70 degrees. I flushed around 10 gallons, and made 10 gallons, still tds reading 1, Really frustrating.