Any decent dealership will fill ALL holding tanks with fresh water to check for leaks and proper sensor wiring. They should have been emptied before delivery. We leave fresh tank full to demonstrate water pump, water heater and toilet.
If you took it home and then used it with both valves open and the cap on, there may have been a bit of mixing. I would just fill the gray tank with fresh water, rinse and go on about your business.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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