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I had (past tense) carpenter ants. The pro at the expensive pest control place said they are almost impossible. Repeated treatments, $175 per treatment.
One application of this (squirted some in a jar lid, and left it on the table) and havn't seen an ant since. No kidding!
Hint: Don't buy a lot of stuff on your first order from this catalog, cause they keep sending catalogs. And every couple catalogs they have a "Buy $25 and get $25 freee" coupon on front or back.