It's not worth using anything other then fresh outside air to raise ph.
How many teaspoons per gallon to raise PH? Also how much will it raise it?
before you do anything what are your ph numbers? High and low.
True that, Jeff. Unless, if topoff is being done with RO, switching to kalk will help to maintain (not raise to) a higher pH.
Excellent point Joel. I use kalk and it helps. I can't believe I forgot to mention it lol.