I've had good luck keeping down snail populations with horticultural grade Diatomaceous Earth used as a preventative. It's not a quick killer, but will kill most insects and snail/slugs through dehydration.
I apply it to my plants at the rate of approximately 2 tablespoons per pot every other week the day after I water them. It doesn't last well through a real drenching and runs out of the pots. Susan Taylor
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