Yes, I know about the freezer smell...we were only out of power for a few days, and it definitely is a real PITA. Still lost a good bit of my frozen stuff.

If you have a way to circulate the water, then it won't hurt to add the shock--at least it will prevent multitudes of new mosquito generations....but I wouldn't put too much effort and worry into actually clearing up the water until you have pump and filter.

Janet