Some science behind the scenes
Molluscicides
Molluscicides also known as snail baits and snail pellets, are pesticides against molluscs, which are usually used in agriculture or gardening, in order to control gastropod pests specifically slugs and snails which damage crops or other valued plants by feeding on them.
A number of chemicals can be employed as a molluscicide:
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Metal salts such as iron(III) phosphate and aluminium sulfate
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Metaldehyde
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Methiocarb
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Acetylcholinesterase inhibitors, highly toxic to other animals and humans, acts also as a contact poison
For more details see the list of products in Alan Woods' Compendium of pesticides