I have a very high PH of tap water (8.0) and I use the FoxFarm trio of nutes (Grow Big, Big Bloom, Tiger Bloom) and it balances my water to right around 6.5-6.8. I use soil too. You want your PH for soil to be between 6.5-7.0, and you only need a drop or two of the PH Up to get your PH between...