hi guys recently got rid of my ro membrane as was taking to long to fill my tank up. I'm now running my system off twin di vessels bought a month ago my tds was 000 perfect. I checked the other day to see if it had changed much but had a shock. The water going in is 008 then wen it goes through but the water in my tank is 081tds. So I'm guessing my tank is contaminated any advice as it's clearly not the resin ?