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How much per gallon do you use?

Thank you all!!! Ditching the stones tonight to see if that helps

Im having problems with keeping my ph down, and looking for suggestions. I have been fighting this from the start (2 + years) I am running a recurlating nft, stinkbud style, with a 11gal sterile res, with air stones. and jacks 321 nutrients. With no other suppliments. My tap water runs about...