I don't know how long you could make it last for, but I remember a story about a guy maintaining a semi commercial pool that compensated for a broken feeder by uncapping jugs of chlorine and droppping them into the deep end. The chlorine would gradually be released into the water. This probably only works well with continuous circualtion, otherwise chlorine might collect in places and do damage. It seems like the smaller the hole you made in the jug, the longer it'd take to release all the chlorine.
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