[Winegrower]

Matt,
I just ordered a product called Unique Tank Sensor Cleaner from Amazon in hopes it may solve the problem. I'll let you know if it works.
In the meantime I'd still like to know where the sensor is located. Perhaps I can remove, clean, and replace it. As it is I'm watching water consumption and dumping the black tank before it is full. During the rinse and refill cycles to clean the tank I overfilled once and had water accumulate in the bay. Fortunately it was after several purges and was clear water but I found out why the plugs are in the floor.