Not all household sprays are in cans. Some kitchen items and perfumes will appear in artificial containers or bottle containers with activation handles, and when you fasten them back and forth, aerosols will form. These sprays (supposedly nebulizers or atomizers) are dispensed in an absolutely changing manner.
The tagged photo shows how the aerosol sprayer works
The bottle contains only liquid ingredients: no propellant at all. When the trigger mechanism is pumped, the air pressure in the tube down into the bottle is reduced. Because there is air in the bottle, at the top, the liquid is forced to move upward. The pumping mechanism drains some of the liquid through a tube into a smaller nozzle, so it becomes a high-speed aerosol of fine droplets.
The biggest advantage of the sprayer is that it does not require propellant, so it is safer to use. But they are usually not as fine or even sprayable as aerosol cans, so they are not suitable for products such as paints and polishes. In order to keep them running, they must be drawn out very hard, so it is difficult to release a small amount of product with them.
You pump the activation fluid up and down, expelling air from the nozzle (initial).
The escape of air will suddenly produce beads in the air at the top of the tube in the bottle.
The air in the center of the top of the canteen bears a greater burden than the air in the tube, so it pushes the liquid downward. The aqueous solution flows upward along the pipe under the action of the pump.
The hydrated leaves act as a thick mist of spray.