Kondens Kompressor is an irrigation system based on the reuse of PET bottles and the exploitation of solar rays: a small bottle, cut in a half, is filled with water and put on the ground, then a bigger bottle (5 liters) without the bottom is put upon the first like a cap. In this way when the sun hits the bigger bottle, the temperature rises and it creates a greenhouse effects: the water in the smaller bottle evaporates and on the bigger bottles you’ll find new drops that will irrigate the ground below.
This system reduces the waste of water and favour the reuse of PET bottles.
Reference:
http://kondenskompressor.blogspot.it/
