My RO setup is working fine. But after reading a thread about the using of the "Rubbermaid Brute" trash cans and maybe leaching po4 , I tried testing mine. I made up 60gal and let it sit for 4days then started by checking the TDS One showed as 3 tds ,but the other showed 780. I think I had some undissolved Alk buffer and or undissolved ph buffer in the last 3or4 gal before refilling. Can this be the cause ???
