From what I've been told, you don't PH your water with living soils... Usually you only filter your tap water to remove the chlorine and chloramine... many will disagree and think I'm crazy, but my water PH is at an 8 after I run through the filter...and I think my plants look pretty dang good! I'm in living soil and do not water till run off also. If you insist on PH'ing it, only PH it to a 7... let the soil do what it's supposed to do, all the microbes and fungi etc are natural PH balancers.