I get rid of ant mounds using this easy method. Remove the top of the mound with a shovel and then continue to dig down another 4"/ 10cm. Set a garden hose to trickle into the depression so that there is no runoff but the basin is always full of water. Leave this in place for 2 weeks. Ants move or drown. I have clay soil so it doesn't seem to use much water. I don't know if it would work in sandy soils. This method has worked well for me.
Paul Cross
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