As the only EPA-registered granular snake repellent product, this product has greater than 91% repellency rate for rattlesnakes and garter snakes. The efficacy of this product makes it an indispensable resource in keeping your property free of snakes! This product is detected by the snake"s auxiliary olfactory sense organ and disrupts its sensory reception. The disorientation causes the snake to slither away unharmed, in search of fresh air.