Salt Water Storage


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I'm using Red Sea Coral Pro salt and mixing a batch up every Saturday morning for a water change.  I'd like to increase the amount of water I mix at any one time and store the extra for the next weeks water change and save myself some time.  How long can I store the water for?  Thanks!
I have stored mine for over a week before, I just have a power head in there so it isn't sitting stag-nit.