Most of the ants died after only one application of the diametrious earth. It did rain the next day so maybe that is why they didn't all die. I put some more on the last anthill where there seemed to be some survivors. Jeff's recomendation: If you have ant problems then diametrious earth is the way to go.

Update: The Diametrious Earth didn't work. I ended up using Green Cross and THAT worked.