Slugs are the number one bone of contention to gardeners. To pellet or not to pellet...that is the question. While pellets do kill slugs it's important not to use pellets that will also kill birds and other wildlife that eat them. A second point about pellets; consider why slugs eat them rather than your tasty veg or flowers....the reason of course is that they love 'em! Now, here's the dilemma...scattering slug pellets will attract slugs to them, that we know, but guess what...it's not only 'your' slugs you see arriving. It's slugs from next door and beyond! So if you want to please your neighbour and have lots of slugs visit you, scatter away!
There is a product called 'Nemaslug' which kills only slugs. It contains millions of microscopic nematodes. You have to make a solution of it and water it around your plants. It's very effective and doesn't harm other creatures even if they eat the dead slug, but keep it away from your fish pond! It cost around £10 for enough to treat 40 sq metres.
Other cheaper alternatives are successful to a point; sinking a tin with a couple of inches of beer in will certainly catch a few, ( the tin should be at least 1" above ground level or you risk the chance of drowning all those fast moving friends, the night-time preditors) spreading lots of prickly holly leaves around is a small deterent. You could try ringing your plants with Bran. The slugs love the stuff to the point of eating themselves to death,
but the best means of defence is to become a detective....get hold of an old pair of kitchen tongs or even a long handled fork, and go night-time walk-about. You'll catch lots of 'em. During the early hours, walk round your garden and find the slime trail...follow it...it will lead you to their day-time hide-away. Get rid of the occupants and make that place slug proof.
Please don't use salt, either on your garden or on the slugs....on your garden it's poison for your plants and kills beneficial bugs too. If you contemplate salting the slug itself, think on this, a slug is a nuisance but torturing it to death with salt is hardly a humane act. If you're close enough to put salt on a slug, then you're close enough to dispatch it quickly and painlessly.
Pic one is a small slug, but look at the damage it can cause.
Pic two are slug eggs. Look for them alongside borders, especially wood or brick edging.