You can get a liquid form of the blue pellets and it works a treat.
Steph, do you mean Slugit liquid?
Preventive measures you can take include:
Transplant sturdy plantlets grown on in pots, rather than young vulnerable seedlings. Protect transplants with plastic bottle cloches.
Place traps, such as scooped out half orange, grapefruit or melon skins, laid cut side down, or jam jars part-filled with beer and sunk into the soil near vulnerable plants. Check and empty these regularly, preferably every morning. Proprietary traps are available from garden centres.
Place barriers, such as copper tapes (Vitax Copper Slug Tape, Agralan Copper Slug Tape, Growing Success Slug Barrier Tape) around pots or stand containers on matting impregnated with copper salts (Slug and Snail Shocka, Agralan Slug and Weed Mat). Moisture-absorbent minerals can be placed around plants to create slug barriers.
(Westland Earth Matters Slug Blocker Granules, Growing Success Slug Stop andVitax Slug Off, ). Gel repellents (Westland Earth Matters Slug Blocker Gel, Doff Slug Defence Gel) can also be used to create barriers around plants. These products are widely available from garden centres.
http://www.amazon.co.uk/Westland-Earth- ... B0031RG7OC
£5.99 you can use it like decrative stone.
Go out with a torch on mild evenings, especially when the weather is damp, and hand-pick slugs into a container. Take them to a field, hedgerow or patch of waste ground well away from gardens, or destroy them in hot water or a strong salt solution
Some birds, frogs, toads, hedgehogs, slow-worms and ground beetles eat slugs and these predators should be encouraged in gardens.
Rake over soil and remove fallen leaves during winter so birds can eat slug eggs that have been exposed.