Backpack ULV Sprayer works on gasoline engine, Backpack ULV sprayer in opposite to thermal fogger is a cold fogger type, so it operates using cold fogging techniques. To produce fog into small droplets Sprayer are equipped with Engine that produce a high power. The fogging solution is stored into a tank and when sprayer is operating the liquid gets pumped out of the tank. Solution then gets pumped into a special nozzle that is construed in such a way to give the air flow a Straight -mist motion. A high air pressure produced by the engine helps to spray the liquid trough the nozzle separating it into tiny particles. The liquid solution gets sprayed out of the nozzle in form of a fog or a fine mist.