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Lower the PH value
Scrubbyjimbobanswered grow question 6 months ago
Vinegar works OK as a temporary solution but I dunno if I'd use it long term for pH control. Vinegar is harmful to beneficial microbes. Vinegar isn't buffered so as it breaks down you could experience pH swings at the soil level. It's also a relatively weak acid, depending on concentration you may need to use substantially more than you would a real pH down product.
m0useanswered grow question 6 months ago
If the PH is the problem, then almost any acid can be used. Some work better then others.
I use a Phosphoric acid for my down sometimes and reticently I have also tried a mix of food grade acids as well like citric, malic and ascorbic acids. It also works for me, I wanted a dry powder option as its easier to store then liquid and does not degrade as fast. Tartaric acid was another I was going to add into the mix but could not find it. all just fruit acids.
Vinegar can also be used. It will lower the PH, long term use I don't think its good idea in soil. in hydro I don't think it matters you not trying to build a working relationship with the medium over a long period of time. Also pure vinegar at 5-10% is a excellent weed killer just spray it on top and at the roots or in between stone walk ways where they grow. drys out and kills em.
Good Luck!
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