High PH locks out the nutrients used. I have about the same PH on my tap water.
Usally I fill the water in a bottle ( you fill the amount you need to water 1 time) and let it sit for a day and if it is still high PH add a teaspoon of vinegar in about 2 liters of water re check PH, usually it helps to lower PH.
Usally I fill the water in a bottle ( you fill the amount you need to water 1 time) and let it sit for a day and if it is still high PH add a teaspoon of vinegar in about 2 liters of water re check PH, usually it helps to lower PH.