First Defense Premise Treatment kills fleas, cockroaches, ants, silverfish and waterbugs. Once the salt-like granules have been thoroughly brushed into the carpets, rugs, upholstered furnishings, cracks and crevices of flooring and baseboards there is no need for reapplication until twelve months have gone by. Defense Premise Treatment contains no harmful chemicals and is made from sassolite, which is an enviormentally friendly mineral. It also kills insects in the larval stage, which prevents them from maturing and reproducing. Within a week, or so, the infestation is ended and First Defense will continue to work to prevent re-infestation for a full year.