Finally, a natural option for treating fleas! Treat your flea problem at the source, by killing flea larvae in the soil. Once in the soil the nematodes in Ecomask will begin hunting down and killing flea larvae. Up to 90% of the larvae can be killed in the first 24 hours. A flea shampoo can still be used to kill the adults on pets, but the nematodes will take care of the larvae in the lawn! Beneficial nematodes are soil dwelling organisms so they cannot be used inside. Be sure to vacuum regularly and wash the pets bedding until infestation subsides.