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Lithium Hypo is also good. 8-)
My local HS dealer recommends using Lithium Hypochlorite. All of their spas in their showroom are on Lithium. It's a recipe that was derived by Gary Keegan.
The only thing that I worried about is getting bleach on clothes or somewhere else that may be destroyed by the bleach if it got on it. I even used bleach to shock.