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@glynmoody I'm not sure they have the physics of that right. It's pressure differential that drives the flow, and it sounds like they're handwaving away the pressure from the water column in the output line. They may be depending on the siphon effect, but I'd want some independent analysis of the math behind this. If just running a vertical pipe to that depth doesn't result in flow out the top of the pipe, I can't see how this is going to work the way they say it does.