David Hare-Scott writes

Both the air lift pump and hammer pump lift a proportion of water from a
body of water that has a head over its destination without input of
energy from the outside by using some of the energy in the head. You
say both types are very inefficient.

They are in that only a small proportion of the available energy is used
for useful work.

Whether that matters or not depends on the situation.

Certainly neither can be considered as 'new' or 'not described
scientifically'.

--
Oz
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