Here is what I think happened to the black water tank. I think the seals on the valve allowed the liquid to pass but not the solids. I will stick a hose in it tomorrow and try flushing it out. I don't have much room in the tank. I put a small pump in the toilet and pumped all the liquid I could out and made a little room for tonights guests. Why in the heck is the grey water tank not draining? I can run a hose into the tank. I blew compressed air thru both vent pipes. I blew air into the gray tank and black tank. The monitor reads the grey tank as half full and it will not drain. It has a open valve and monitor reads empty usually.
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