1 x Doff Slug & Snail Killer 400g. 1 x Doff Slug & Snail Killer 800g. Slug & Snail Killer 400g. Slug & Snail Killer 800g. Slug & Snail Killer 650g. 3 x more active ingredients, compared to most Ferric Phosphate Pellets on the market, which contain 1% Ferric Phosphate.