Pingman, if you give me some detail on how you are using it for carpenter ants? Are you mixing it with something, in what ratio? Where are you putting it? Thank you.
It’s already helpful to know it works on this specific type of ant. But I have heard you need to mix it differently depending on which type of ant you are targeting.
I just sprinkle 20 Mule Team borax powder around my foundation, and around any active ant nests, or along their paths; annually. No more ants, and cheap to boot.