Quote Originally Posted by stinkyattic
You should use 'real' pH down, rather than vinegar, which is relatively unstable and best used in emergencies.
Nitric or Phosphoric acid is good for plants. Use the sort at the grow shop to be sure.
So, is hydrochloric acid (used for pools) not good for plants? Or is it just too strong for most folks to work with?

PC :smokin: