1. It's probably not chlorine gas per se, but something worse , like nitrogen trichloride!
2. In one sense, the shock was probably still 'good', in the sense that it still contained 95% or more of its original chlorine strength.
3. Having opened many containers of old chlorine, I'd personally take back any chlorine material that's off-gassing. It's fine, once it's in the pool, but it's nasty to work with.
4. The "anyone with a basic . . ." claim is nonsense. We have plenty of people here, with advanced degrees in chemistry, that still have to learn about pool chemistry here. Pool chemistry is not normally taught in either basic or advanced science classes!
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