You can adjust a solutions pH down with any acid. It's finding one pot can live with in solution for our tasks. Ask about citric acid. Comes dry in powder form and is mixed with water (we use RO in medicine). Virtually anything compatible with human life is not going to harm pot chemically. Citric acid is cheap, safe and easy to store. It is one of the components of pH Down along with phosphoric acid and and ammonium fertilizer component. Vinegar is OK but don't think it isn't strong because it's in your kitchen cabinet.I have a DWC cloner I built. I know the pH has to be in the 5-6 area, but I can't find any pH down anywhere in town. I've heard of people using vinegar to lower pH, but will using as much vinegar as it takes to get pH down to that low be harmful to my clones?
i have never used vineger for ph down i buy ph down at the pet store but i heard it has no buffering qualitys so it wont relly last long from what i heard i hope im wrong though good luck