Depends on the temp and how close to "drinking" water it was to start with.
If it is cold, dark, and was clean to start with it will keep for a very long time.
One oz of 6% or so Clorox in a 50 gallon barrel would get you about 8 ppm total Cl. With what would be in the barrel and the stuff in most all well water, the free Cl would be down around 4ppm which is the max residual here in KY for public water. If you are a little worried about it, an oz would make it "keep" alot longer as long as the "grow'n" in what you are worried about.
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