Editing Solar still (section)

== Efficiency ==
Condensation traps are sources for extending or supplementing existing water sources or supplies. A trap measuring {{cvt|40|cm}} in diameter by {{cvt|30|cm}} deep yields around {{cvt|100|to|150|mL|USfloz}} per day.

[[urinate|Urinating]] into the pit before adding the receptacle allows some of the urine's water content to be recovered.

A pit still may be too inefficient as a survival still, because of the energy/water required for construction.<ref name="Alloway2000">{{cite book|last=Alloway|first=David|url=https://books.google.com/books?id=g0pXR2qylP0C&pg=PA63|title=Desert survival skills|date=2000|publisher=[[University of Texas Press]]|isbn=978-0-292-79226-5|pages=63–65|access-date=9 May 2013}}</ref> In desert environments water needs can exceed {{convert|1|gal|L|order=flip}} per day for a person at rest, while still production may average only {{convert|8|USfloz|mL|order=flip}}.<ref name="Alloway2000" /><ref name="Force2008">{{cite book|author=United States Air Force|url=https://books.google.com/books?id=uYz4ODJ5XhsC&pg=PA285|title=U.S. Air Force Survival Handbook|date=1 April 2008|publisher=[[Skyhorse Publishing]]|isbn=978-1-60239-245-8|page=285|access-date=9 May 2013}}</ref> Several days of water collection may be required to equal the water lost during construction.<ref name="Force2008" />