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RonL said:As best I recall you never restrict intake and you can choke the discharge but never completely (that has to do with heat buildup in the seal area).
You might look at diaphragm pumps these can be air operated (or electric) and they are positive displacement pumps that can be operated at very slow speeds, here a speed controller would give just a bout any flow you need.
Ron! This I have never seen or heard of. Can you tell me if there are ones that pump up to 12 feet of water in height and can do it slowly? Can you tell me if these are quiet? I seen some on youtube but can't tell how quiet they are.
If you can give me any advice on these I would be very appreciative.
G