The sheep wool pellets don't work. I put them down and then a couple of hours later watched a snail crawling right over them.
I use the old method of crushed egg shells - apparently anything that makes rough going for them deters them a little bit, I keep finding just one bite taken out of a raddish - it would seem they don't like them much!
Sheila, I don't want to be alarmist but my friend decided to try collecting sheeps' wool from fences, got bitten by a tick and ended up in hospital with Lyme disease so please use all possible anti-tick measures.
PS I don't know if the sheeps' wool worked, I was too busy sympathising about the illness.
As a sheep owner I doubt if sheep's wool would work as a deterent for slugs and snails but it is a great mulch, takes ages to rot down and carries it's own fertiliser if you use daggings( the dirty wool trimmed from a sheeps rear end) Also good for lining hanging bakets but birds do like to steal it for their nests