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Old 07-13-2018, 06:34 AM   #2
Restorium
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Join Date: Apr 2018
Location: Nebraska
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Maybe rain came in through the tank's roof vent?
And/or;
If the two exit valves on the tanks both leak, or are both left open, and you have a cap on the main exit, or clog in sewer connection, then the gray tank could fill the black tank until it overflowed the toilet.
And/or:
If you are connected to a sewer, and the sewer backed up, your toilet could overflow.
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