Product Description Growing Success Advanced Slug Killer is a blue pellet containing a naturally occuring active ingredient (Ferric Phosphate). The pellets can be used as bait for the control of slugs on bare soil and in all edible and non-edible plants. Slugs prefer moist and soaked granules. On moist soil or in humid conditions, granules take up water and begin to swell. Once attracted to and consuming the bait pellet, slugs cease to feed.