Termidor Termite Barrier system is a chemical substance that is undetectable by termites. Once termites travel across the barrier they carrier the substance back to their nest on the property. Any termites they come into contact with will die within a period of 5 to 21 days. The Termidor termite barrier system is a long term solution and has minimal maintenance however upon termites being detected we recommend a yearly termite inspection to ensure those nasty pests are kept at bay.