By the time you notice fleas on your pet there is already an infestation of pre adult fleas in your home these are not affected by treatment applied to your pet so your home must be treated to eliminate them acclaim household flea spray contains precor a long acting insect growth regulator which prevents flea eggs and larvae from maturing into adults this breaks the flea life cycle and gives your home continuous protection for 12 months when used as directed it also contains an insecticid