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@gottagrowsometime, I never said the rockwool would keep pH 4,5, which indeed would be over 30x more acidic (or 4 100x acidic) than it should be. Still, I've never heard of anyone even soaking or "treating" their rockwool in such acidic water intentionally so I was just curious and you mentioned having pH issues. But I'm glad you got it! Lol.