So I've filled my tank up and when I started filling it was 000ppm, just checked it now and it's 012ppm.. I use a 300gpd ro and it comes out of there at around 020ppm and goes into my di, I changed the resin other day and it was fine. So do I empty my tank and start it off again or will 012 be ok?? Also, when changing resin do you have to pack it down tight? Lol of you know what I mean, any help appreciated /emoticons/smile.png