Knockout Area Treatment by Virbac (14 oz) Kills fleas and ticks Contains a unique combination of ingredients that kills both adult and pre-adult fleas Even kills fleas before they grow up to bite Contains IGR, which continues to kill fleas for 120 days after application Use one fogger for each 6,000 cubic feet (approx. 27 ft. x 27 ft. x 8 ft. ceilings) of unobstructed area