On Mon, 3 Feb 2003, dr. Imre Bartfai wrote:

*>I have got the idea, too. Unfortunately, all the pumps are available here
*>must be submersed into water for lubricating purposes - at least, the
*>salesman told me. Any workabout?

Are you sure those are air pumps ? Because there are aquarium pumps that
are really pumps and just pump water through a filter. Those do indeed
need to work immersed.

I have never seen an air pump that needs to work immersed although I know
such things exist. They are disk (Tesla) or centrifugal pumps that make
enough vacuum in the intake to suck air in, while immersed. They are not
quiet.

Peter

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