Has anyone heard that it may not be good to us rain or RO water for indoor growing because it has NO PPM and it strips your soil of alkalinity I'm right here baby what's up added some calcium to my water and about my PPM up to 86 and my plants look great after 48 hr.
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I just heard a podcast the other day talking about that. Apparently R.O. water is corrosive and can strip calcium from the soil as well as your teeth and bones if you drink it on a routine basis. I just make sure to add cal-mag to mine and all seems well.