I try to keep mine about 6.0. Buy a PH test kit form you hydroshop. The ones in garden centres arnt accurate enough If you can afford an electronic Ph meter it makes life easier. I use Phosphoric acid as PH down and liquid silicon as PH up. The silicon also helps to give strong stems. Both available from UK hydro shops
moondog Reviewed by moondog on . pH levels? Hi, how high can your water pH levels be without effecting the plants? what symptoms do you see when the pH is too high? thanks Rating: 5