People do all sorts of things to defeat the slugs and snails yet the old fashioned answer of slug pellets has fallen out of favour even though it is effective, cheap and easy, because of fears of harming pets and wildlife
Now there is an answer in that you can use the safe Ferramol based Organic Slug Pellets, which I think are actually better than the older and cheaper metaldehyde based pellets, and get rid of your slugs and snails.
Always read the instructions on the pack and follow them. Using too many slug pellets can actually be counter productive
The same goes for any garden chemical – even organic ones!