It all depends on the alkalinity of your water. Read the ph management article in my sig.
demoreal Reviewed by demoreal on . PH down..how much do I use? I bought some PH down, bottle does not give me directions on amount to use per gallon. My tap water is 7, looking to get down to 6. Just water for my mother plant that's in soil right now. How much PH down do I use per gallon? :) Rating: 5