I use the store bought stuff only because I have some left. I'd like to make my own and have seen the recipe on here a few times, but it list the hydrogen porxide as being the 3% stuff that you can buy over the counter just about anyplace.
Some time back, I think it was Greg/MO who provided a link to another recipe where the guy used swimming pool quality/strength HP. If that link is still around...I'd like to try it.