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Old 10-19-2021, 08:13 AM   #2
AZ Traveler
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Join Date: Sep 2017
Location: Oro Valley
Posts: 3,933
M.O.C. #20477
Thomas,

The black tank readings take a clean tank. It just takes a little TP stuck to the side of the tank and it will not read right. Recommend you tape over that light and dump your tank once a week or so. You can hear it burp at the toilet as it gets full.

Your gray tanks and fresh water typically work fairly well.
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