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By Black and Gray tank probes work most of the time. After last draining and in storage they usually go to Empty.
Gray flushes itself
Black usually gets 3-4 Fill and Flushes for weekly dumps.
i use Happy Camper in the Black Tank.
Galley tank reads 3/4 or Full all the time. Never have been able to get those probes to work despite Pressure washing and various treatments...
Doesn't matter as it doesn't fill in a week.
I dump once a week when "fulltiming"
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