My 1/2 bath sink flowed into my black tank and I had 5 tanks totaling over 200 gallons, was never an issue. If you must, wash hands in kitchen sink, then you can illegally (at least in most places) drain your gray tank onto the ground, as you mentioned.
Maybe we should call you "TankMan". Just sayin.
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Steve & Betsy
2017 DYNAMAX Isata 3
Days Camped, Not Enough
So you can make a quick Kerig cup while you wait for 4 cups of coffee to brew. All bases covered.
B and B
2013 Rockwood 8289 Diamond Edition
GY D's/2.5 inch lift kit/Powerhouse 4 KW EFI Generator
2016 Ford F 350 Lariat Power Stroke Diesel Crew Cab FX4
2008 Golden Falcon 380PA Park Model Model "Oh Canada,True North Strong and Free!"