It usually sits below water level, and fills the root zone with fog, raising humidity in the rooting medium. Water particles are 5-15 micrometres in size. The hanging roots absorb the water/nutrient combination for accelerated growth in hydroponically grown plants. When combined together, turns a hydroponic system into an "aeroponic" hybrid system.
An ultrasonic fogger is not an aeroponic mister. These are often confused. While foggers ultrasonically create fog (also used in hydroponics to raise humidity), the aeroponic mister atomizes water into a nutrient-rich mist by either dripping the water on to a spinning plate or a by using special gardening tip on a pvc tube[clarification needed]. The mist is 100% oxygen rich along with the benefits of maintaining 100% humidity, providing the entire plant system with an aerated (hence "aero" ponic) root medium. This technique speeds growth significantly. It also assists with nutrient absorption.
- George F Van Patten. Hydroponic Basics.
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