You would NOT have a backflow issue since impeller pumps are positive
displacement.  One big advantage of the impeller system is the suction hose
could be routed to the very lowest point in the bilge sump.  Impeller pumps
are self priming down a few feet.  While the float switch would shut off
before complete emptying, you could empty the sump on "manual".

With a typical centrifugal pump, you can only lower the water level to the
inlet of the pump.  Don't know about your boat, but on Touche', that leaves
a bunch of water in the sump.  The only way I can empty it is with the
manual pump.

Disadvantage might be trash damaging the impeller.  However, impeller pumps
are widely used for bilge pumps on many, many boats.  There was one on
Touche' when I bought it.  I stupidly replaced it with a centrifugal pump.
:(  Should have left it.

Dennis

On Tue, Jan 15, 2019 at 2:40 PM Richard Bush via CnC-List <
cnc-list@cnc-list.com> wrote:

> Dennis, I like your suggestion of the Ultra Safety systems switch and the 
> water
> puppy pump; that's about $300.00 (+/-); what would the advantages (or
> disadvantages) be over the traditional systems...?
> How would the hose be routed?  Would you still have the backflow problem?
> Thanks
>
> Richard
>
>
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