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Fosters's avatar
Fosters
Explorer
Dec 11, 2016

Waste Valve Always CLOSED or Always OPEN?

Research, Previous Owner, & 1 or 2 RV Owner's I happened to ask: Conclude and Advise me to ALWAYS LEAVE WASTE TANK CLOSED till she fills so the Tank can build Gravity for BOTH the dirty waste and semi-dissolved black waste to ALL exit the tank and force of gravity to force down the sewage line and into the waste station. So........once a week every Sunday I Empty my Waste/Black Tank.

And for my Grey 1 (bathroom sink & shower) and Grey 2 (kitchen sink) I ALWAYS LEAVE THEM OPEN, period.

I've been helping a fellow RV Elder here in the Campground with changing out his propane tanks. And I happened to ask him who is helping him pull the Waste Valve every week or so? He said What???? So I explained the above, and he called it B.S. Told me as long as I have a slope/pitch on the sewer line I am fine and to LEAVE MY WASTE VALVE OPEN ALL THE TIME!

He is an older gentleman and has been RV'ing for some 5 decades he tells me, i.e. why he calls what I am doing B.S. He has a 5th, but very older model (if that has anything at all to with it, but I tend to believe not or ?).

Ok folks, the Voting Machines are now open and THANK YOU TO ALL IN ADVANCE, as I'm a full-time RV'er now entering cold Winter on the East Coast! So am I going outside every Sunday like a dope or am I going outside like a smart RV'er taking care of his Coach so NO waste build-up occurs in my Tank, possibly hardens n hardens n hardens and suddenly no room for waste and then a back-up into the Coach Toilet Floor...Yikes!!!

27 Replies

  • I leave my black tank valve closed until the tank is at 3/4 or more, then drain. And run the black tank flush after that.

    I suppose there are some tank designs in which his method would drain ok. But I would not want to try.
  • On a risk-reward basis, what can happen if you do it the old timer's way vs what happens if you keep doing it your way? :)

    BTW it is not the gravity, it is to have enough water in the mix to properly flush your tank.
  • He is one LUCKY camper if he has not had a pileup and clogged tank.
    You are doing it right. Only change would be to close one of your gray tanks a couple of days before you empty the black tank so you can open the gray to help FLUSH out the hose after you have dumped the black.
  • Fosters wrote:
    Translation?


    If you leave the drain valves open, your poop forms a pyramid in the holding tank.

    An RV toilet is not like a home toilet, where every flush uses a two gallons of water.
    Poop will build up in the drain hose if you leave the valve open.

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