What can be used as a natural pH up substance for my medical marijuana plants water? I have them growing in soil & have been using citrus powder to lower my ph.
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Define "natural" – JohnFx Sep 20 '21 at 22:35
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Are you trying to make the water more acid or more alkaline? – kevinskio Sep 20 '21 at 23:59
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please clarify what you are trying to do,PH up or PH down.and please post the PH and hardness of your tap water. – trond hansen Sep 21 '21 at 04:03
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look for "cal" at a mexican grocery store; fine white powdered calcium. ashes (wood/charcoal) are a strong base as well, though you will need to filter the mixture if you're growing them hydroponically. – dandavis Sep 24 '21 at 06:21