First Defense Premise Treatment kills fleas, cockroaches, ants, silverfish, and waterbugs. A single application of First Defense protects homes against infestations for a full year. 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! No harmful chemicals - First Defense is made from sassolite - an environmentally friendly mineral. It eradicates fleas and other infestations without introducing chemical-based pesticides into the home. First Defense dehydrates and kills adult fleas and insects that ingest the salt-like granules as they move around the floor or furnishings in your home. 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. Shipping weight: 2 1/4 lbs.