Questions about PH and Nutes

Hey Everyone, I have a quick question about pH levels and nutrition.

First, what do people use (or recommend) to treat the soil to make the pH level go up or down. Second, since you are adjusting the pH won't that effect the ability of you to see if you should add more or give it a break on nutrition since that effects the pH?

Third and final, how good are grow bags? I mean they are SO much cheaper than pots, and I was wondering if they worked good with soil. I don't want to use hydroponics.

(I'm going to be using Fox Farm 3 Pack)

Um, you can make the pH go up of down with SUPRISE pH Up or pH Down. Get it at your local hydro shop or online. Google. As for the nutrients, most nutes are pH buffered, which means you won't be changing the pH if you add nutes.