just for fun....
here is how theoretical physicist and nobel-price-winner Richard Feynman solved his ant-problem:
http://biocontrolbeat.wordpress.com/...xic-ant-ferry/ he got rid of all of them within one hour without killing a single ant ^^
but it works. the easier way would be to find out which trail the ants are going, and where they are coming from, and keep disrupting the trail until the pheromone trail is gone and they no longer know how to get to the tub. i strongly suspect they are coming from outside, it seems really unlikely that you have an actual ant colony anywhere inside your home.
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