Originally Posted by dtoste77
We’re new to the PNW (Portland Area) and plan to use our rig in the winter time. The Portland area can freeze on some nights but not to the same extent as other parts of the county. We’ve already had 1-2 days this fall were it dropped 1-2 degrees below freezing. I’ve been draining the water heater, cleaning the water pump filter and using the blowout method per the manual. Also leaving some antifreeze in the traps/drains.
Question about the black tanks. I usually use some Happy Camper with 2 gallons of water (which has worked great). Am I ok to still do that? Or should I leave the black tank empty with a little antifreeze in it instead? Portland typically only freezes in the night for a few hours and not a consistent all day freeze or for extended periods of time. I wouldn’t think 2 gallons wouldn’t expand all that much but I guess there are also the valves to contend with.
Anyone in that area have any experience?
I am in Dallas area and your weather sounds like ours although we have not had a freeze yet. This is going into our 2nd winter since owning a RV. With the exception of you putting deodorant in the black tank during the winter you are doing exactly what I did last year and we had no issues.
However....This year I was playing around one day with plenty of time on my hands, so I go to a dump facility and let it drain completely, did the sani flush for extra 20 min and water coming out looked as clean as Ozarka Spring water
So assuming I was completely dry; I wanted to test it
I left the Black tank valve open but put the cap on. Drove home and opened the cap only to find that I had 2 gallons of black water come out
So what learned... The wau my coach is designed if you drain on level service it will never get all of the black water out. Gray water yes at 100% as it drains from bottom of my tank. Black water on on my tank drains from the side. Using my hydraulic lift, when I raise the rear of coach about 3 inches, my black tank goes completely dry
So to answer you question you have to assume you have some black waste water still in the tank and if you drive it, it may get in the valve, I would add at least 1 gallon maybe two in black tank filling p traps in the process.
My resolution is still in process.
I bought the jet flo macerator and dedicated black waste hose so I can pump to my home sewer connection, or toilet at home. I will raise the rear of the coach a few inches before pumping out of the black tank. When I finish with black tank flushing, I will then open valve for gray tank, some of the gray will flow back into the black tank. When pumps run dry, I will lower the RV. I have yet to see if any more residual gray will come out when RV is lowered? If so; I will turn pump on again with black tank valve closed. My point and purpose is to be 100% certain that my black and gray are 100% empty. I should not need any anti freeze, in fact I may leave valves open with 3" clear extender and 10' Rhino hose connected to the cap as a safety precaution. No worries about some liquids I should not have freezing my rhino hose