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Old 04-25-2019, 05:02 PM   #2
KeithInUpstateNY
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Join Date: Feb 2017
Location: Potsdam
Posts: 319
If you search "black tank sensor" you will find tons of threads with a multitude of ideas on how to deal with it. Long story short, the sensors read from the top down, so if there is something stuck to the top (full) or next (3/4) sensor that is what it reads. Many of us just don't rely on them.
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