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After what I've seen build up in the foam block prefilter of my RO/DI unit, I won't be switching to tap water anytime soon.
The fact of the matter is that tap water is highly variable depending on where you live. Because one person has success with it does not equate to everyone having success.
It might also relate that the original poster stated that he did not often change water. This would limit the import and buildup of any impurities in the imported water and would reduce the risk of a negative impact from less than pure water would it not?
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