I have read here where someone started and was halfway done with a slam before the test kit arrived. And was very successful. Many many more were told to wait.
So this is my question... What is THE most important criteria that must be known when/before starting a SLAM?
Is it CYA?
I would think that the amount of gallons of the pool and putting the chlorine into the pool after the mechanics (pipes and filters and whatnot) would be an awesome first strike in the war.