I used the sentricon( not sure of exact name) system. No poisons, they put
stationa around the house and wait for activity. When they get they add a bait
they stops termites from reproducing(their skeletons break). It's slower but it
worked here without treches and poison. Used local guy about $1300.
You can find out about it at Teminex or other big companiy web sites or yellow
pages. i didn't use them big they have good info.