How to use a cart-type water-based fire extinguisher

Should be operated by two people, when using, first push or pull the fire extinguisher to the fire site, stop at about 15 meters from the fire point (when used outdoors, should occupy the upwind direction), by a fire extinguishing personnel to the direction of the fire to unfold the spray belt (no twisting phenomenon, do not put down the fire extinguisher), and hold the spray gun with both hands to make it open to the root of the flame, stand in a lunge towards the fire place, and then another fire extinguisher can open the fire extinguisher switch to spray.