" At the top of the pipe you place some thing that resembles
an oil-well pumping jack that beats on the water in the pipe
[The analogy is crude, a piezoelectric hammer seems like a
better idea {Model 710M02 Piezoelectric Actuator from AVC
instrumentation, Depew NY/1995 update}]."
Don't have any other info on it these days.
>Second part (going by the picture) is the outlet valve which my neighbour
>rightly commented could be replaced by a simple valve to just let the water
>out when it pulsed upwards. Just checking, however, just incase there was
>something else it was doing.
Not that I know of.
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