If anyone would like to see one in operation, head to your nearest wastewater treatment plant. They are the norm for the "headworks" because they lift water with all manner of, um, solids in it.
As for pressure, who are you guys kidding? When is the last time anyone had more than a few psi in their water cooling setup?
If they were an economical solution to low flow, low pressure pumps, we would see more available. As things are, cheap centrifugals dominate the pond pump market.
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