I don't know about freezer, I personally would not freeze it.
I assume you are talking about Sodium Chlorite SOLUTION?
Theoretically "indefinitely".
I have kept mine in the fridge for WELL over a year with no problem.
I also do occasional tests with Chlorine Dioxide test strips to make sure it is still viable / potent.
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CHP – The Clean Health Protocol
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You will find info there regarding Jim Humble's "MMS Health Recovery Guidebook".