Water-saving nozzle mountable on a faucet

A method of discharging water through a faucet, comprising:

• providing a nozzle attachable to a faucet, the nozzle being switchable between a spray-mode and a mist-mode, the nozzle having a housing having an inner cavity defined therein, the inner cavity having a vortex screw disposed at a lower end therein, the housing having an opening defined therein in fluid communication with the inner cavity, the housing having longitudinal straight grooves defined therein and an orifice defined therein at a bottom portion thereof, the inner cavity having a first filter disposed at an upper end therein and above the vortex screw, the opening being disposed between the first filter and the vortex screw;
• attaching the nozzle onto the faucet;
• switching the nozzle to the spray-mode;
• flowing water into the inner cavity and then through the first filter;
• when in the spray-mode, flowing water out through the opening, disposed between the first filter and the vortex screw, and then through the grooves and discharging the water as a spray through the grooves at a bottom of the nozzle,
• switching the nozzle from the spray-mode to the mist-mode, flowing the water through the vortex screw to create a rotation of the water when passing the vortex screw;
• rotating the vortex screw to engage helical-shaped threads with an internal threaded portion of the inner cavity to longitudinally shift the vortex screw relative to inner walls of the inner cavity to increase or reduce the water flow through the threads and to affect an angle of a cone-shape of a mist and a size of water droplets in the mist;
• and
• discharging the rotating water through the orifice as mist.