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- #25,761
Pure water has a PH of 7. There shouldn't be a need to check PH unless/until you add something to it and there should be no need to check PH, at all, if using the kit with a good water source.
Distilled water has a neutral pH....but the pH swings wildly with the addition of only a few H+ or OH- ions added, because by definition there are no buffers in H2O.
If you're using a large bucket of dirt, checking pH of the feed water is a useless practice, based on ignorance and the worst sort of tradition.
However, checking and adjusting the pH of the soil is super smart and effective! Due to the mineral content, High Brix soil is 6.4 pH. Period. You'd have to pour a quart of bleach or a half gallon of pool acid into a 7 gallon pot to change that number. The idea that the pH of a medium can be "raised" or lowered by adding a few drops of pH up or pH down to a nutrient solution is just silly.
I understand why people do it. I know where they got the ideas to do such things.....but anyone with a background in chemistry can understand why such practices are useless and often harmful.
Man that list is getting long 
it’s a cross of silver Nevil cut reversed x Cali O (16yr old cut)
