Editing Solar still (section)

=== Inclined Solar Still ===
[[File:Sketch of an inclined basin-type solar still.jpg|thumb|Sketch of an inclined basin-type solar still]]
An inclined solar still operates by allowing short-wave solar radiation to pass through a transparent glass plate while trapping the long-wave radiation emitted by the heated sand and water inside the still.<ref name=":2">{{cite journal|last1=Anjaneyulu|first1=L.|last2=Kumar|first2=E. Arun|last3=Sankannavar|first3=Ravi|last4=Rao|first4=K. Kesava|date=13 June 2012|title=Defluoridation of drinking water and rainwater harvesting using a solar still|journal=Industrial & Engineering Chemistry Research|volume=51|issue=23|pages=8040–8048|doi=10.1021/ie201692q}}</ref> This trapped heat raises the water temperature, increasing the evaporation rate. The resulting water vapor condenses on the inner surface of the glass plate and is collected using a channel. This type of still is utilized to produce potable water from brackish sources and to examine its effectiveness for defluoridation. A variation of this method, known as earth–water distillation, involves using wet sand or soil to extract water in arid regions. Sand is used within the inclined still to retain a stable water layer, preventing overflow. Without sand, feed water would spill over if its free surface height exceeded that of the collection channel.<ref name=":2" />