Doff Slug & Snail Killer MAPP 18982 PCS 06422 is a Ready to use bait containing 12.5 g/kg hydrated ferric phosphate (technical) [at least 9.79 g/kg anhydrous ferric phosphate]. Presented as a ready to use baited pellet in an easy to use large sized 800g bottle which can treat approximately 210 square metres.