dont have any expierence with it but I use "Tank buddies" Its tablets that you are supposed to use in your fish tank to keep the ph at 7 I just put them in my water and my Ph in my soil turns out to be 6.8 maybe im lucky.
Use the stuff that comes with the kit. That stuff seems to last forever (well almost). You know it works and it's safe. You are going to be smoking this stuff are you sure what you are putting on it is okay to put into your lungs?