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A comment on Nanofiber membrane makes seawater drinkable in minutes. Parent comment

Re:Nanofiber membrane makes seawater drinkable in minutes by yazaddaruvala on Sunday July 11, 2021 @01:25AM (#27798655)
That’s why you have a pump to move the water horizontally into different tanks. Then there is a 100m column and a 95m column forcing the water through the membrane.

So the pumps still need energy by “very little” energy because they are doing relatively little work.

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Re:Nanofiber membrane makes seawater drinkable in minutes by erpellan on Monday July 12, 2021 @08:29AM (#27809562)
That is the equivalent of having a 5m column on one side and being open to air on the other side.

There is no free lunch - for the membrane to experience 100m of water pressure on one side only, something else has to be reducing the pressure by the same amount on the other side.

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Re:Nanofiber membrane makes seawater drinkable in minutes by thisrod on Monday July 12, 2021 @04:36AM (#27808271)
> Then there is a 100m column and a 95m column forcing the water through the membrane

In that scenario, why do you think it helps to put the membrane 100m deep, instead of 5m deep?

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