Hacker News Reader

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.

View on HN

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.

> 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?

Reply on news.ycombinator.com