Storing saltwater (NSW)

I doubt very long. Aeration and circulation are important with water storage. I have no experience with NSW but would think the stuff inside it wouldn't appreciate lack of o2
 
If you're asking how long your water can just sit around before you use it, I would say just about indefinitely. It's not going to spoil and as long as you storage container is dark, there isn't much growth of algae ( also you're not adding nutrient so nothing will live long anyway). Just check ph and and salinity before use and adjust accordingly.
 
I agree with above. In a clean tightly sealed container in the dark the stuff should last a very long time.

Remember, this is the method for preparing sea water for use in aquaria. You cover it and let it sit in the dark for a few weeks, ect.
 
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