13 responses

  1. Doug Jones
    March 11, 2014

    I’m afraid that that their claim “The energy that’s required and the pressure that’s required to filter salt is approximately 100 times less.” is complete and utter horseshit. Current technology has reached 50% of ideal efficiency, and it’s immaterial how thin the membrane is, what matters is the osmotic pressure losses. The best improvement physically possible is only a factor of two.

    • turtles_allthewaydown
      March 31, 2014

      Unless they can also save on the pre-osmosis filtering and chemical treatment steps. Then the overall savings, including the recovery ratio of water before and after the osmosis step, might approach their numbers.

      Also, percentages can be described in multiple ways. You say the current process is about 50% efficient, so you can only do 2x better (comparing both to theoretical maximum). However, a system that is 90% efficient would only have 10% loss, so you can say it went from 50% to 10%, or a 5x reduction in losses (compared to the existing system). Of course people will describe their own system in the more flattering way.

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