Steve, Wonderful to be back in touch with you!
The shower sump is a foot or two below the waterline. The sump hose dumps into the galley sink drains just under the sink. The shower sump pump comes on when the Rule switch rises and pumps until the switch falls enough to shut off the pump then the water in the hose from the pump to the sink drains falls back into the shower sump. This amount of water is enough to raise the level in the sump to just below the level that will turn the pump back on. Under some conditions the pump will actually constantly cycle so I installed a temporary switch to stop that. Since the automatic switch works most of the time, I will install in a convenient location and on-off-auto switch which I consider the easiest fix. It's just not on the top List page yet. The end of the discharge hose is above the pump so the water will not drain out the discharge end when the pump stops. I cannot shorten the discharge hose. I have no above-the-waterline thru hulls except for the two diesel exhausts. Norm S/V Bandersnatch Lying Julington Creek FL > Norm, I'm not sure how a manual on/off switch would solve the problem. Isn't the issue really how high the pump discharge is from wherever discharge water ends up? My thinking is that if the discharge end of the hose is sufficiently below the pump then there wouldnât be any backflow since gravity or head pressure should completely empty the hose. I'd think the only way to eliminate the issue would be not only a "run dry" pump, but a pump strong enough to push sufficient air through the hose to "push" the remaining water completely out of the hose into whatever it goes to, either an above waterline thru-hull or a really, really deep bilge or something. S
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