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                        Partial vacuum using pulser pump
The pulser pump can produce a partial vacuum by pumping to at least 4 meters and letting the water fall back to earth through a pipe as shown. You have to have a valve to get a regular constant "suck". I have tried a long u tube instead of a valve but it does not work in a stable way. It can be used to power filtration in a lab or to do vacuum drying. I do not know if the vacuum drying  application is that workable (you might not be able to get a great enough vacuum) but vacuum filtration is certainly easily achievable.

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