Does saltwater go bad?

[camclee]

I buy my saltwater from a lfs.
I was wondering how long it can stay in the 5 gallon jug before I use it for a water change.
Also I buy fresh top off water at the lfs, Does that go bad?
I'm asking because I'm oncall at work and never know when I have to go in.

Thanks

 

[Jeff]

Unless you contaminate it with organics it shouldn't go 'bad' However, especially on the salt water, if it sits in the closed jug for a week or more I will run an airstone in the jug overnight before using it. The aeration will bring the pH and oxygen levels up.

 

[camclee]

Thanks DheereCrossing.
I wasn't sure if it was "safe" to use if it has been sitting around for more than a couple of days.
I guess "bad" was the wrong word.
Thanks again.

 

[aentrop]

Don't leave it in direct or bright light or heat, but other than that it should be fine for a few weeks.

Airstone a little while before using it is not a bad idea...

 

[Jeff]

The idea with the airstone thing is it'll bring the pH up and also I don't want to add a large quantity of O2 depleted water to the tank all at once. Good question though - good to ask before making assumptions.