#reverse-osmosis

#reverse-osmosis

The major obstacle to using the sea to meet human water needs which the UN puts at between 50 and 100 liters per person per day is that it contains too much salt to drink, and actually causes dehydration. Reverse osmosis, today's dominant desalination method, uses high-pressure membranes to filter out the salt, leaving behind drinkable water. But every liter produced this way generates an almost equal volume of brine.