The INO Elite 90-day refills are an important component of the strongest odor control system available on the market today. Ideally, the ultra concentrated refills are used with the INO Elite Pro 90 dispenser. They are also compatible with other dispensers on the market. When using with the INO Elite Pro 90 dispenser, set the control at 90. When using with other models of dispenser, follow the manufacturer's instructions in order to obtain a shot every 45 minutes. Product can be used in all rooms and locations requiring a quality odor controls solution using aerosol cans. 3000 shots or one shot every 45 minutes for a 90-day period. 1 refill is enough to replace three conventional 30-day refills.