I added one to my <a href="http://www.reefcentral.com/forums/showthread.php?s=&threadid=1172882" target="_blank">DIY (Sort of) RO/DI</a> and you can read all about it there. Now tap water TDS is 285, after RO its 2 and 0 after the DI resin. Also I’ve order twice from The Filter Guys and they were fantastic! I’ve heard AZ has some high TDS water. What is yours running after the RO?
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