check the archives, there are many detailed answers to your question.
The absolute most effective way to kill ants is to use a bait. It is the least toxic and the most effective. I am an exterminator and have tried many products on ants. If you can find a bait they will take, unless the active ingredient is too concentrated, it will kill the colony.
The problem with carpenter ants is they are picky eaters and it is difficult to find something they will take. You may be able to find Tero. I have heard on this group that they will take it. The products I use are not on the consumer market.
If you can follow the ants home to their main colony, you can bust it open and spray the whole clan. This could be effective if you find the colony. They don't bite or swarm to you like fire ants when you disturb the nest.
Good luck
The absolute most effective way to kill ants is to use a bait. It is the least toxic and the most effective. I am an exterminator and have tried many products on ants. If you can find a bait they will take, unless the active ingredient is too concentrated, it will kill the colony.
The problem with carpenter ants is they are picky eaters and it is difficult to find something they will take. You may be able to find Tero. I have heard on this group that they will take it. The products I use are not on the consumer market.
If you can follow the ants home to their main colony, you can bust it open and spray the whole clan. This could be effective if you find the colony. They don't bite or swarm to you like fire ants when you disturb the nest.
Good luck