| I'd use citric acid or something like that in a pinch, but I'd never use battery acid. I try not to feed my plants anything that isn't manufactured specifically for human consumption or for growing plants for human consumption. Maybe if I grew ornamental plants or something, but I won't waste hydroponic space on flowers. True hydroponic pH up and down is lightyears ahead of the DIY stuff because it has buffering agents included that allow it to not only effect a change in pH right now, but to help hold that change over the long run. If you use straight acids like coffee, lemon juice, and so on you'll often find that a few hours later your pH has jumped back up. Real hydroponic stuff is worth the time. You can order it online and have it shipped to you if there isn't a local place to buy it. |
Here is a link that might be useful: Here's where I order
