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Tony,
The only useful sensor is on the fresh water tank.
When the greys are full they will harmlessly overfill into the shower or sink. When the black starts to fill, it will burp when the toilet is flushed.
It is best to wait until the tanks are nearly full to dump - they will evacuate with more force cleaning them out better than if there was very little in the tank.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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