I live in the SW and my TDS here at home is 150-200'ish. Ive always used tap water - no issues that I know of. I recently was given a RODI system and will be installing it when time permits.
I'll run with it for a few months and see how my main tank responds...
I am guessing that there will be nothing noticeable. However, if there was ever a problem with the water you'd never notice if your running RODI.
Its that 1-2% chance.
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