I use pool store liquid chlorine and dilute it myself. Laundry, mopping, etc. and did some old rock I left in the yard for a few years.
Sprayed Rock with hose. Placed rock in bucket with tight fitting lid in solution for one week, spray down again and 2 days air dry.
Pool chlorine is around 15%
Bleach is around 4%
I've been using ~ 1/8c (2tbsp) to 1 gallon