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I have tried nearly all the available auto switches for the bilge including the sonic ones and pressure sensing circuits. Nearly all of them failed sooner or later.
Now I use two bilge pumps: One is connected to the service battery and located deeper than the second one. This is the "always" working one. The other is located higher than the first and the source is the engine battery. If the first one fails, the second one works. There is small electronic circuitry that informs when the second one operates. This way I can keep the bilge dry (nearly).
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