The Nippon Ant Bait Station is pre-baited, making it clean and simple to use. Kills the ants in their nest without mess or trace. Suitable for indoor and outdoor use. Contains Spinosad. Apply at the first signs of ant activity. How to Use Remove readily available foodstuffs. Remove bait station from pack and twist the base of the unit to open the access holes. Place the bait station on a flat surface as near to the entrance of the ants nest as possible (do not disturb feeding ants as it is essential that feeder ants take the bait back to the nest to the rest of the colony). An effective dose is usually built up within the colony over 7-10 days depending on the size of the ant colony and the frequency of ant feeding.