CEA technologies include hydroponics, aeroponics, aquaculture, and aquaponics. Underground farming is usually done using hydroponics, aeroponics or air-dynaponics systems or container gardens. Aeroponics used 65% less water than hydroponics. Excellent aeration is the main advantage of aeroponics. Ultrasonic humidifiers are frequently used in aeroponics, where they are generally referred to as foggers. With the use of aeroponics, growers cloned and transplanted air-rooted plants directly into field soil. Repeatability is the key to aeroponics and includes the hydro-atomized droplet size. Aeroponics eventually left the laboratories and entered into the commercial cultivation arena. He designed the first aeroponics and in practice showed their suitability for plant cultivation. Aeroponics possesses many characteristics that make it an effective and efficient means of growing plants. On Earth, these problems may hinder the economic feasibility of aeroponics for commercial growers. Aeroponics offered researchers a noninvasive way to examine roots under development. Aeroponics is also widely used in laboratory studies of plant physiology and plant pathology. This advancements are very useful in space aeroponics. Reese says, aeroponics offers the ability to make bio-pharming economically practical.