LogiKill for Fleas 10 Million Treats 400 square feet Contains beneficial nematodes, which are naturally occurring microscopic roundworms that hunt down and kill flea larvae and pupae in the soil A great alternative to harsh chemical flea treatments and easy to apply with a watering can, hose end sprayer or pump sprayer Completely safe and non toxic for people, pets and plants! Environmentally friendly and will not harm other beneficials like earthworms, ladybugs and praying mantids