how long will used water keep?

fixed

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I'm changing tanks, and had a problem arise after I drained the first (a 55 g fowlr). The water is being stored in 5 gallon bottles. Anyone have any idea how long the water (which I assume had bacteria, waste, etc., in it) will keep? I hate to waste all that saltwater, plus I'm thinking it would help to "seed" a new tank. Thanks.
 
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