There are a range of ways to get rid of slugs in your garden. These range from slug pellets to a slug picker-upper and everything in between including giving them an electric shock.
Slugs are very fond of young, soft-stemmed plants, and if you grow seedlings outside you will lose most of your young plants unless you do something about slugs and snails.
Slug Pellets
Metaldehyde slug pellets kill slugs, but also harm other mammals and birds. The effect is similar to that of DDT and it becomes more concentrated the higher up the food chain you look. Slug pellets are becoming harder to find and most gardeners are trying other ways to kill their slugs.
Iron Phosphate pellets also kill slugs and are harmless to other animals, as well as fertilising your garden and lasting a lot longer.
Copper Bands
Wide copper bands around plants will prevent slugs eating those plants. Large slugs can 
cross narrow bands by humping their bodies, and as slugs can grow up to 6 inches long, you need bands at least 4 inches wide. You do need to clean the copper bands with vinegar every few months or they will stop working.
Copper bands do not kill slugs, so they will just go somewhere else in your garden
Salt
Salt kills slugs, but by the time you have chased every slug with a salt cellar you would be better off just standing on them. The salt dehydrates the slug and it dies in about an hour. Salt will make your soil unsuitable fore growing almost anything, so this method is not recommended.
Slug Picker Upper
If you have the patience to go around picking up every slug then this is the one for you. You collect the slugs alive and take them for a very long walk before emptying them out. As an alternative you could try chop sticks or tweezers.
Ammonia
Spray your slugs with dilute household ammonia cleaner. They die, the ammonia acts as a fertiliser, too.
Rough Surfaces
Slugs hate crawling on rough surfaces like sandpaper, broken eggshells or cinders. You can surround vulnerable plants with any of these and the slugs will go somewhere else looking for food.
Sheep Wool Pellets
This is a fairly new product, but it works well. The pellets rot down over a 12 month period to provide nitrogenous fertiliser. They act as a mulch as well as deterring snails and slugs. The pests are not killed.
Beer Traps
Slugs are attracted to the yeasty smell of a honey/yeast mixture or beer. Put a little in the bottom of a jam jar and sink it so the top is level with the soil and slugs can just crawl in. The slugs drown.
Shock Your Slugs
You can buy bands to place around pots and containers that work in conjunction with a PP3 battery to give your local slugs a non-fatal electric shock when they try to cross the band. The shocks are undetectable to pets and children.
Nematodes
Nematodes are microscopic parasites that prey on slugs and slug eggs. One application a year will kill all the slugs in the area covered and any more that come into the area, too.
Nemasys
This is a more wide-ranging pest killer than nematodes. It contains a variety of parasites that will kill other soil pests such as carrot fly leatherjackets and cut worms.
Ducks
An old country saying, “If you have too many slugs you don’t have enough ducks.” Keep ducks or chickens and your slug problem will soon disappear, as your slugs are turned into duck and chicken protein…
Fito Slug Stoppa Granules
This is a very absorbent material that you spread around vulnerable plants. Slugs cannot cross it because it absorbs the slime that they use as a lubricant between their bodies and the ground.
