I am using a well (which I drilled BTW) and having just as good a luck without the RO/DI as I did when I had it hooked up. It is nice to fill my 30 gal. water change trash can in about a minute. My TDS is 130 but most of it is probably calcium due to the limestone.
My best looking tank was on well water at my parents house. I had great sps growth.
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Michael
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