The problem about Lemon's or Vinegar is, does it change any of the other nutrient loads(Mag., calcium, iron, ext....)
I would hate to use one of those and have a whole new set of problems.
I will definately look into it though, it's worth a look!
Actually, here were I live. I have high PH levels, I use almost double the dose of PH down just to get it below 7.
Thanx