It is a system of irrigation for the hydroponics, also called by misting or spraying ( Also micro ). Droplet.
Drops of liquid that usually do not notice at first glance. For example, when talking about saliva droplets are thrown or when you download the toilet tank and the water droplets flying out of the Cup.
Small drops
droplets is incorrectly written and it should be written as "Microdose" being its meaning: Microdose: Is called microdose to a method of treatment that is to apply one or two drops sublingually ( under the tongue ) for a more rapid absorption of the active substance through the central nervous system.