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Sensor, schmensor.... I gave up on these. Every 3-4 days before I retire for the evening I grab a chair and sit at the valves to empty and backflush the black then close, then the galley flush and close, then the gray (shower/lavatory) flush and close. If we have visitors I do it more often and as discretely as possible because some visitors cannot handle the thought (I'll leave it at that).
For my rig the typical Full indicators are now: 1.) The black tank burps on a flush, 2.)the kitchen sink does not drain, or 3.) the shower does not drain. Any one of these will prompt me to drain all 3 (why worry about individual tanks).
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