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I never fully exhaust my SW. I have a 5gal. bucket (w/ a MJ1200 and Ebo 150w) full of SW for w/c's. Since I only do 1 gal. a w/c I never use all the pre-mixed SW. I've been doing this for almost a year now w/ no ill effects. I don't know that there is an experation time for pre-mixed Sw as long as it's circulated. I would think RO water would not go bad either as long as it's stored in a sealed container. But, that's JMO.
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