Forum Discussion

path1's avatar
path1
Explorer
Jun 13, 2016

Do you think this water saving mod worthwhile?

Saturday when picking up a part for my trailer I ran into a guy that has the same model as ours but few years newer. We got talking and he told me how he extends his boondocking time via pumping his gray water to re-use in his toilet.

TT has 2 gray water tanks, one for kitchen and one for bathroom (shower and sink) He hooked up a water pump to his bathroom gray tank then to his toilet. He can twist a valve and pump water from his self contained tank or twist valve the other way and can pump water from his bathroom gray tank to his toilet. Neither one of us had our TT with us. Just picking up stuff at RV place.

While I think the idea has some merit I wonder just how much this would extend boondocking time. We very seldom we run out of space in the bathroom gray water tank. Black tank would receive same amount of use. For us, any extended time would because of water savings on the fresh water tank.

Does anybody see any other downsides to this mod? I see the pump being a shorter life because of soap residue and hair? Of course, one could also just drain the gray water into a gallon jug and use it for flushing.

Does anybody know how many gallons of water your toilet goes through when boondocking?
  • 2oldman wrote:
    sch911 wrote:
    Wow I'd hate to smell his bathroom....
    Yeah, I was thinking that too. Also, it may stain the toilet bowl.
    I agree. I would never consider it.

    Someone suggested a filter. All a filter would do is separate any particles from the grey water. The bacteria still gets through.
  • Valve failure or Opps wrong valving and grey fills up fresh water tank.......:S


    Typically one runs out of fresh water PRIOR to filling waste tanks.
    Except when you have a galley then it will fill before running out of Fresh water.

    All three of my waste tanks use a 'common' drain header.......so I have another valve on common header.
    With it closed I can equalizer galley & grey, grey & black, galley & black, Galley, grey & black.

    So I ALWAYS run out of fresh before I run out of waste tank storage.
  • sch911 wrote:
    Wow I'd hate to smell his bathroom....
    Yeah, I was thinking that too. Also, it may stain the toilet bowl.
  • Interesting. You could always add a filter before or after the Grey Pump to catch the nasty stuff in the grey tank.
  • I don't doubt that could be done safely, but personally, I'm not going to do any modification that in any way connects waste water to the fresh water system. It's just too icky to consider.

    Flushing doesn't use much as I'm sure you know. But I've not measured it. What I know is that I encourage using as much as reasonably possible when flushing. It makes for a well maintained black tank. I encourage DW to conserve in other places, not the toilet.
  • It's an interesting idea. I don't know if it's worth the expense/effort.
    You could have the potential smell of gray water in the toilet, and another pump to clog or fail.

    I think it would be just as easy to carry a couple extra 5 gallon jugs of fresh water.