Hey Everybody,
I do industrial water purification for a living, and work with RO's that pump out 100 gallons per minute. I agree with everybody saying that the systems can be run on tap water. The big problem with running on tap water are the variables. Municipal water treatment systems add different things throughout the year to maintain the public system, and then you have flooding conditions, and a plethora of many other changes that happen throughout the year. It doesn't take much to knock a reef system out of balance. After all the money most reef aquarists have invested in their systems, is it worth the risk over 200-300 dollars? Another point, TDS just tells you there are ions in the water other than water, not what the ions are. 10 tds doesn't sound like much, but what if it was 10ppm of phosphate(TDS is equivalent to ppm in most cases). Just another point of view, not intended to offend anyone. If anyone has any RO/DI questions, I would be happy to help.
Mike
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