DIY Doctor

Main navigation

Toilet no longer flushing properly after move

Postby pir8ped » Mon Jul 11, 2022 1:10 pm


I redesigned our bathroom which involved moving the toilet in order to put a gas boiler against the outside wall.

Since I did that, the toilet doesn't flush well. It used to flush fine, but now we sometimes have to resort to tipping a bucket of water down down to remove persistent floaters.

The cistern is the same, and at the same height. I'm guessing the change is due to previously, the waste pipe was vertical after a very short near horizontal stretch. Now there's a 2.5 metre near horizontal waste pipe before the drop down.

I really don't want to change the position of the toilet again, and it can't go back where it was. Can anyone suggest the easiest way to improve the flushing efficiency? If necessary, I can swap the toilet and cistern, but change it to what? I don't want to change model and get the same result.

Grateful for any suggestions,

Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Mon Jul 11, 2022 12:59 pm


Simply Build It

Postby stoneyboy » Wed Jul 13, 2022 9:25 pm

Hi pir8ped,
You do not say what sort of wc you have.
Assuming it is close coupled, where the cistern sits on the pan, check the size of the flush unit, it will either be 11/2 or 2 inches. It may be either a siphon type or plunger type.
You need a 2" plunger type for maximum flush effect.
Make sure you have connected the pan using a full bore adaptor not a multi quick one where the fins fit inside the waste pipe.
Regards S
Rank: Project Manager
Posts: 5514
Joined: Wed Dec 10, 2008 6:44 pm

Postby pir8ped » Thu Jul 14, 2022 4:57 am

Aha, it's a 1.4 inch syphon type. I'll change that for a start.

Thanks very much!
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Mon Jul 11, 2022 12:59 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics