I corrected my previous post because I am such an idiot. I had already put a percentage of 73% for calcium hypochlorite in my spreadsheet which is why I thought it would produce lower available chlorine. I was wrong...dead wrong.

So, calcium hypochlorite and chlorine gas are nearly equivalent with regards to available chlorine. So if you get 65% calcium hypochlorite, then this is about 65% available chlorine. Sorry for misleading anyone earlier.

Richard