(206) 949-5683, Top Rated Plumber, Seattle
Page 2 of 2 FirstFirst 12
Results 16 to 24 of 24

Thread: Toilet bowl empties when flushing another (back-to-back) toilet

  1. #16
    DIY Junior Member ramsey76's Avatar
    Join Date
    Jul 2006
    Location
    Massachusetts
    Posts
    4

    Default

    Terry

    Thanks for the input

    If I replace the second toilet with a Toto G max model, will that make the problem worse


    I realize I may a draw on bothn toilets, but besides that any other issue

    Last edited by Terry; 12-19-2013 at 12:01 PM.

  2. #17
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,412

    Default

    Pretty much any new low-flow toilet works because it starts the flow by moving the water faster through good design. So, it is not a problem unique to Toto, but would be true with nearly any brand.

    When you do flush a toilet, it assumes that it is starting with the designed level of water in the bowl. If, for some reason, the level was reduced (depends on how much), it may not flush well and require a second cycle (the first refill resets the bowl water height, the second does what the first would have done had it started full in the first place).

    how much, if any, of a problem it might be varies from none to annoying depending on exactly how yours are connected, the distances, and the piping layout.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #18
    DIY Junior Member A.J. Gross's Avatar
    Join Date
    May 2012
    Location
    Aberdeen, WA
    Posts
    1

    Angry Toto drake causes a "fountain effect" in toilet of adjasent bathroom.

    We really like our new toto drake toilet, however it has created a problem for us. When flushed it causes a bubbling and splashing in our other toilet

    in our master bathroom. The toilets are back to back with a wall between them. We can also hear gurgling and sometimes see a splash in the master bath shower.

    Is there a plumbing answer to our dilemma? This was never a problem with the toilet we had before the Toto. Thanks, A.J.

  4. #19
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,412

    Default

    Toto warns that, because of the high water velocity, if the proper fitting is not in the wall, you can get water shooting across. This is true with most newer, water saving toilets and is not unique to Toto. The older toilets flushed slower, and you could get away with the fitting in the wall. It's likely you won't fix it until you tear the wall apart to put in a new fitting. This has been discussed a lot...use the search function.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #20
    DIY Junior Member Pete@miramar's Avatar
    Join Date
    Dec 2013
    Location
    duxbury ma
    Posts
    1

    Default

    Has there ever been a retrofit solution to this problem? I have 15 toilets with this problem with the drains in a concrete slab and 15 more on the second floor. Maybe something that involves cutting into the wall and sectioning out a piece of the vent stack and putting some kind of divider down into the cross tee to deflect the drain flow.

  6. #21
    DIY Junior Member ellymae's Avatar
    Join Date
    Dec 2013
    Location
    Florida
    Posts
    2

    Default Burping toilet

    Have a condo on top floor with a brand new Kohler Cimarron toilet in guest bath, and new Toto (either dual cyclone or Gmax? flush) in master bath. When you flush Kohler, the Toto has a big burp which spatters all over the rim. Plumber came out today and filled all sinks, tub, then let everything drain at once. Everything drained fine, but toilet still burps. Pulled the Toto and ran a camera down to see if there was a plug...all lines were clear. Replaced Toto with another Kohler Cimarron, so that both had same puddle amount. This did not correct problem. Others in the building have been having the same burping problem. The plumber explained that since this has happened only after the bigger puddle (3 gal) toilets were replaced, there is not enough water weight, therefore the burp. Also the design of the plumbing in the building, as well as the toilets being so close to each other was a factor. In his 30 years of plumbing, he has never run into something that he could not fix. He even went up on roof and dropped a penny down each vent stack.

    Any thoughts or comments would be appreciated.

    Ellymae
    Last edited by ellymae; 12-20-2013 at 03:58 PM.

  7. #22
    DIY Senior Member wjcandee's Avatar
    Join Date
    Apr 2012
    Location
    New York, NY
    Posts
    1,591

    Default

    Are the toilets back-to-back? That's probably how your question ended up in this thread...

    In other words, does the wall of your guest bath share a wall with your master?

    It isn't the weight of the water that is likely the problem; it is that there is a higher velocity of the flushes in newer toilets (I say newer because they have been mandated for more than a decade). This clears the bowl with less water. When these toilets are mounted back to back with a simple cross, water from one can shoot across into the closet bend and trapway for the other, leading to water sloshing around in the other toilet. This was less likely to happen when toilets lazily-sloshed water down the closet bend and into the drain stack; the lower velocity water didn't shoot across.

  8. #23
    DIY Junior Member ellymae's Avatar
    Join Date
    Dec 2013
    Location
    Florida
    Posts
    2

    Default

    Quote Originally Posted by wjcandee View Post
    Are the toilets back-to-back? That's probably how your question ended up in this thread...

    In other words, does the wall of your guest bath share a wall with your master?

    It isn't the weight of the water that is likely the problem; it is that there is a higher velocity of the flushes in newer toilets (I say newer because they have been mandated for more than a decade). This clears the bowl with less water. When these toilets are mounted back to back with a simple cross, water from one can shoot across into the closet bend and trapway for the other, leading to water sloshing around in the other toilet. This was less likely to happen when toilets lazily-sloshed water down the closet bend and into the drain stack; the lower velocity water didn't shoot across.
    Thank you for responding. Yes, the toilet does share a wall with the master, but the toilets are not back-to-back. This really has only started since switching to the 1.6 gal flush, no matter what the make of the toilet. My plumber is going to join this site, so hopefully he will chime in here shortly. This is a great forum...lots of info and answers.

  9. #24
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,412

    Default

    It all comes down to the actual fitting in the wall between the two toilets. Your situation would be even worse with a pressure assisted toilet which pushes water out faster than the gravity flush toilets. As said, the older toilets were fairly slow emptying the waste...most of the new ones, trying to do more with less, have a means to get the siphon started almost immediately, rather than the water swirling around, getting deep enough to trigger it. Toto warns of problems in their spec sheet unless the proper fitting is in the wall - see page two http://www.totousa.com/Portals/0/Pro...ST454CEF_G.pdf, but it is not unique to Toto.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

Similar Threads

  1. Back-to-back toilet installation
    By JRGlynn in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 31
    Last Post: 03-13-2014, 06:17 PM
  2. Drake Toilet Back-to-Back Installation Questions:
    By jdbs3 in forum Toilet Forum discussions
    Replies: 11
    Last Post: 02-27-2012, 04:19 AM
  3. TOTO Back to Back toilet installation
    By mrenglander in forum Toilet Forum discussions
    Replies: 4
    Last Post: 06-16-2011, 03:17 PM
  4. Recommendation for toilet in a (sort of) back-to-back configuration
    By jadziedzic in forum Toilet Forum discussions
    Replies: 3
    Last Post: 07-06-2010, 06:25 AM
  5. Back to back commode flushing problem
    By cvonkantor in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 3
    Last Post: 03-12-2007, 08:13 AM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •