We're not talking about pool tablets, we're talking about making a bleach solution, out of pool shock chlorine (powder). They're not the same.
And a 55 gallon barrel has 220 quarts so it would take 880 drops of bleach (if it's not too dirty) or twice that if it is. 880 drops is about 440 ml so a coke size can will do.
Emergency Medicine - saving the world from themselves, one at a time. "Thou shalt not be a victim, thou shalt not be a perpetrator, but, above all, thou shalt not be a bystander." I make the ADL soil themselves. And that makes me very happy 
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