A water still comprises an evaporation chamber and a condensation chamber.- These chambers are separated by a common wall.- Warm untreated water is fed from above into the evaporation chamber adjacent the dividing wall.- A stream of air at atm. press. passes through the evaporation compartment and condensation chamber in trun, carrying water vapour with it.- The water condenses on the wall of the condensation chamber, transferring heat to the evaporation chamber
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