Before i ever but any ant power down I normal pour a few kettles full of boiling water over any infested areas. Seems to work well. Then once it's dried put some any powder down.
Nippon liquid. Put it on clean coins (so it doesn't soak into the ground) where they run. It is so delicious that they will carry it back to the nest to share with their friends. Replenish the baits daily, and after rain, until it stops being taken.
Don't use boiling water, you want plenty of ants running about to carry the Nippon Liquid into the nest.
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