How long will ready mixed saltwater keep for?

[sweevo]

HI my LFS sells ready to go saltwater. I'm in the early stages of running a small set up and wondered how long the water would keep in a container at home? Should I stick to getting freshly made saltwater each week or will having a store (5 gallon) that I can use for a few weeks at home be ok?

The tank is only 7 gallon and i'm only looking to keep a few corals etc, ie no fish.

 

[S.Reef]

I let my saltwater age in a container for a few weeks. As long as its not contaminated I think you could store it for about a month.


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90 Gallon FOWLR Marine System
20 Gallon Reef
10 Gallon Nano
20 Gallon Freshwater