DI Resin

Now. /site/DesktopModules/NTForums/themes/_default/emoticons/smile.gif Didn't you just buy your DI unit a couple of weeks ago? My TDS after DI isn't anymore than 1 before I replace it. If your TDS is that high after DI, you may have problems before it that should be fixed. How efficient is your RO membrane? You need to know the incoming TDS to the unit and what it is after the membrane to figure it out. (A-B)/A. IIRC, anything under 96% efficiency should be replaced.

 

If it's the RO membrane, then it's costing you more money. The high TDS water it is passing on is chewing up your DI faster than it should. Do you have a single or dual stage DI?

 

If the TDS of your incoming water is really high, then it wouldn't hurt to add a second DI chamber to make sure that you're getting 0 TDS water.