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You can try a liquid approach - as many slugs have an affinity for beer or ale. Just be certain to make the drink unavailable to pets. The worst part will be the task of emptying the beer/bloated dead slug container!
A spray bottle that contains a dilute solution of ammonia will stop them dead in their slime trails, as well. Ammonia will provide nitrogen to the planting area, and be less deleterious to plants than is salt; albeit the salt is more visually satisfying.