here's a bit of a warning regarding auto-top off systems. i've been running my FW top off water into a reservoir but checking my TDS from the RO/DI unit itself getting a TDS of 0...perfect right?
well, i just checked the water in the reservoir and to my surprise it was 35ppm and that's the water that feeds into my tank!! i guess it just slowly built up in there. so, a quick drain and refill every now and again "cleans" up that problem easily enough. hope this helps someone else.
ps. don't forget to flush upir membrane every week or so.
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Darryl
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