Does anyone know why forward osmosis (e.g. <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=R63zYZZuRvQ" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=R63zYZZuRvQ</a>) hasn&#x27;t taken off yet? It seems like it has the biggest potential to do desalination at an extremely low cost energy-wise.