Vet-Kem Siphotrol Plus II Premise Pest Control Spray, 16-Ounce Fast-acting formula has a 100% knock out rate of adults in 10 minutes 1 can treats about 2,000 square feet It leaves no lingering odor, no stains and no sticky mess Water-based aerosol spray that is easy to apply New carpet-penetrating formula that doesn't leave fleas a place to hide