The specification discloses a solar still module (10) for use in a solar still arrangement for producing a desired condensate from a feed treatment liquid, the solar still module (10) having a treatment chamber (85) including a treatment member (18) positioned below an upper solar energy transmission wall (35) to receive, in use, solar energy therethrough, the solar still module (10) having a treatment liquid supply (27) supplying treatment liquid to an upper end (26) of a first region (25) of the treatment member (18) to flow in a liquid film flow gravitationally downwardly thereover while a component of said treatment liquid is at least partially evaporated and condensed to form a condensate (53) on an inner surface (81 ) of the upper solar energy transmission wall (35), the condensate (53) flowing gravitationally downwardly on said inner surface (81 ) of the upper solar energy transmission wall (35) to be collected at a lower location by condensate collection and discharge means (54, 57), the upper solar energy transmission wall (35) being formed by a clear or highly translucent polymer material with the inner surface (81 ) being hydrophilic relative to said condensate, said treatment member (18) being formed by a thin metal material as a tray having a tray base (19) forming said first region (25), a perimeter wall (20) extending upwardly from the tray base along at least side edges and lower edges of said tray base (19), and an outwardly extending flange (21 ) extending from an upper region of said perimeter wall (20), said flange (21 ) being supported on a support frame (11 ).
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