Cheaper desalination process

OK I have reason to believe that a few youthful bright queers read this board.  Get working on a cheaper desalination process.

A cheap form of osmosis?  Fine. Cover 100 miles inland with trash and pipes that do nothing but pump ocean water onto the trash. The amount of sea water pumped has to equal the amount the sun will evaporate. Periodically lay down new trash.  Bulldoze the areas that cease to retain heat.

TAA-DAA!  It isn't going to get any cheaper than that.