I've used H202 as well but I actually stopped after a few times with the hydroton wondering if somehow there was some sort of interaction happening but nothing changed so I went back to using it.....still with no change. I started them on nutes today and so far seems to be doing the same thing so i don't know.....I'm actually sort of getting used to it but it would certainly be nice not to have to jump on the ph four times a day....