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  1. #1

    Grey tanks with full hookups

    Are you guys leaving your grey valves open on full hookups and if so are you opening both or just one?


  2. #2
    Seasoned Camper mtpocket's Avatar
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    May 2014
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    I was always told to let them fill before dumping. Otherwise you create a bunch of sludge in the tanks and lines. Dump valves that don't close properly could also happen from build up. The rush of water keeps everything flushed out. Have never had tank problems doing it this way.
    Chris and Debbie
    St. Charles County, MO
    2007 Dodge Ram Cummins DRW
    2015 369RL Solitude

  3. #3
    Site Sponsor dchrist1733's Avatar
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    Sep 2013
    Fredericksburg, Virginia
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    I always leave all of my tanks closed until they are full and then dump them. I also put treatment in them to keep them clean, both gray and black. I have not had any problems with tanks but always keep them closed. I have also heard they gum up and it does make sense because the water goes out and the sludge stays behnd.

    Debby - Stafford, Virginia
    2017 Grand Design Solitude ST374TH
    2012 GMC Denali 3500HD DRW

  4. #4
    Fireside Member
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    May 2014
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    I keep my kitchen tank closed until I dump the black tank. I leave the bathroom tank open until 4-5 showers before I dump the black tank.
    Joe - Dallas, Texas
    2014 Solitude 369RL
    2015 Chevrolet 3500 LTZ 4x4

  5. #5
    Joe, that's exactly what we are doing because we found that with showers and the washing machine we could fill that grey tank up in less than a day but our galley tank fills about the same rate as our black.

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