I do not have a dispenser I only use it when I have to I just spray it in to the room If you use it like that it will last you years only one shot per room as needed I have horses so we have fly's but I bought this for the Miskito's and fly's The sent is better then the other brand and it seem to work better and longer JUST take off the cap and press down on the sprayer it will meter it automatically its just a puff that's all it takes just don't go craze with it one puff should do it hold it high over you head when spaying
It get's the job done, awesome product. Clears the rooms and carport, yes the carport. I will be ordering more soon. So glad a friend recommended it to me.