That's kind of what I wondered, if I was having a hard time getting it down because it's well water instead of piped in tap water. I'm honestly not sure if the water I got was reverse osmosis; it was just the same cheap water I had at home already that was 5.8 on its own so I ran with it.
Some good info going on here. Hey Bugs ( Doctorjackalope( change that shit, Bugs) you should have a filtration system installed in the house like one of those tanks that the Culligan Man comes to fuck with. I always assume that the water we are dealing with, to start with is 7.0 and standard mineral composition, but from there, water for GOD'S GIFT TO THE FUCKING PLANET, BESIDES SEX, will have to be fucked with regularly, or shit will go wrong ( just like my wife's ........). Point being, you will have to fuck with PH, you have to adjust. Just add UP/DOWN, to bring it down, or up.(getting fucked up now) LOL. Anyway, your PH will probably go up, so remember this. If you are .2 points, high from away from the sweet spot (5.
you should add .02 PPM to bring the water to 5.8. In other words, if the water naturally goes up .02, (6.3/6.4) you should go to 5.6 at feed time, as you can be assured that the PH will climb past 5.8 until it reaches the point where you adjust it, say at 6.2 Point being, if you want a stable 5.8, you have to add a lower or higher PH at feed time, to get a stable 5.8. (If I want 5.8, and it runs high, I give it 5.6 so it rises past 5.8 to 6.0, then I adjust PH, if it runs high, I bring my solution to say 6.0, so it falls back down to 5.8. I am pretty high now (PH 7.14), because I grow the BEST damn herb in the FUCKING WORLD!!!. (lol, come fuck with me, I love knowledge)