Posted: 30/01/2014 at 18:49
I've had limited success with Pistachio nut shells, they don't like the salt. But my waistline doesn't like the volume needed.
I tried that as well - a few weeks later I found a slug inside the Pistachio shell.
I did read a paper once on using very dilute salt water on the garden. Enough to kill/deter slugs but not enough to kill all your plants. I do think Garlic spray works but it takes months as it is systemic.