How long is salterwater safe to use...

No idea w/PH's... FWIW I've had mixed water sit for a week in covered 5g buckets before using it without any problem. hth...
 
I think as long as its circulating and not sitting going stagnent it would be fine. Many people keep a big tub mixed stirring at all times for emergencies.
 
I'm only running a few 37 gallon totes right now, but I keep one full with RO/DI and one with NSW at all times. I sometimes skimp on waterchanges, so it may sit for a month (in Nashville, can't be that lazy here yet). I run a ph in each.
 
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