1 year ago
Last edited at 7:44PM on 3/8/2013
I presume you are talking about desalination units that are now being developed all over the world to produce pure water from the sea. Israel is really into this and you will find many websites giving details if you look. Basically they are using reverse osmosis to separate the salt from the water - a very special membrane is made that has holes in it that are so tiny water molecules can pass though it, but not the larger salt molecules. Incredible pressures and costs, but you finish up with water so pure it is poisonous!!! They have to add minute amounts of salt back into the ultrapure water so that Humans can tolerate it. Amazingly, ultrapure water will strip essential salts and minerals from the gut of anyone who drinks it!
They also use solar power to evaporate water from the sea and condense this vapor back into potable water. Cheaper, not so easy to do, but very effective once you have the conditions right....