Fast Release formula begins working immediately to eliminate odors within 6 hours for enclosed areas up to 1,000 cf. It is the most effective solution for dealing with situations such as a leak during winter storage that results in foul odors when the boat is opened up. Ideal for removing foul smells or smoke odors from homes, RVs, laundry rooms or other enclosed area. This formula is NOT TO BE USED while people or pets are present; after the area has been treated, use Slow Release Formula to keep it odor-free. Not available in California.