24 hours in fresh well water is trully purged unless of course you have a huge aerated vat like Hawks as Raymond mentioned. ( man I got to go there this year). All their poop shoots will be clear after that. City water will kill them as well as salt if you leave them in it for an extended period.
If you only have a few hours I just spray them down real good with a good nozzle and keep filling, refilling, and stirring until they are clean.
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