The direct evaporation is a perfect and cost-effective alternative to the brine flat collector.
Here, the solar pipes are laid in loops in a trench with, for example, a width of 2 m and a deep of 1. 5 m.
The flat collector draws its energy from sun and rain. This means that the ground above the surface collector must not be sealed: no asphalt, concrete or similar.
Even deep-rooted plants may not be planted on the area used.