I looked at the acceptable amounts of trace elements for the local water here and the problem was that the amounts are enough that if in your tank would/could be a problem. Like nitrates are allowed up to 40ppm, etc. I only have a deionizer but it's nice being able to know which compounds are in your water, as I only do water changes every 4-6 months and it's about 30% max. When I do my parameters check it's exactly what I expect it to be because I know how much dosing I've done with pure water as a base.
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