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Getting rid of MTS (Malaysian Trumpet Snails)

I removed all the gravel (and most of the MT snails) from a tank and was 
going to just dump the gravel, when it occured to me that they might be 
suseptible to freezing. Has anyone ever tried freezing gravel (easily 
done here this time of year) to kill the snails ? I understand that 
people have tried bleach, but the snails remain in their shells, 
impervious to the bleach. Cold however, would penetrate the shells quite 
easily. If they can survive freezing, then they are obviously a real 
danger if released accidentally, if not, then freezing would be an 
effective sterilant for MTS.

Dennis in cold Pennsylvania

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