How long will bottled sea water keep?

[jester50]

Going to pick up filtered seawater from my local aquarium. I plan to pick up using those large blue water jugs (5 gal) size.
Can any leftover water that I do not use be left in those jugs to sit until my next water change? Or will I need to pour it out into a larger container and run a powerheard/airpump in it?

 

[OrionGirl]

Well, I keep SW in a huge tank, with a pump to keep it moving. You will want to agitate it before use, and make sure you don't have evaporation driving salinity up, but otherwise it should be okay sitting around for several weeks.