I try to always keep a batch of SW on hand, you just never know when you need some in a hurry. It's gotten as old as a month or so (stirred with a powerhead and I keep a heater in there, too) before I ended up using it for water changes and I saw no issues as a result of it's "vintage curing."
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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