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I have been using the Metricide 14, which I can use up a gallon a year as I have big tanks. It comes with a activator that should be discarded for aquarium use. The activator is sodium nitrite and adding it will kill fish.

I am wondering why the activator is needed for its original intent use as adding it will shorten the shelf life to 14 days whereas the original content without additive has 2 year shelf life.
 
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