Quote Originally Posted by maik

If you don't want to use pH down, and you're in the know of how much your pH is off, you sould use those Sodium Hydroxide pellets for cleaning the drain, be careful for yourself, and your plants! But it works.
Um, no... NaOH would RAISE the pH. And you should use a liquid pH up/down to avoid getting 'hot spots' in the soil where the pH is off. That will give you some funky symptoms that are hard to diagnose if you haven't seen it before.

And lime is also a pH up additive.