New level access shower room, possible toilet issue

[AdamPD]

Hi all,

So I had a new level access shower room installed, replacing an older bathroom

Everything seemed to be fine, but I started noticing the water in the toilet bowl after flushing, turns poo brown (Sorry for the bluntness)

The original toilet's waste pipe came out of the toilet, then down into the floor and into the waste pipe outside

The new toilet however doesn't

Because it's in a different position, they had to install a new waste pipe outside

The waste pipe from the toilet goes straight out the wall, then along around 2ish feet, then down into the soil pipe outside

I'm starting to think "waste" is getting stuck in the pipe and feeding back into the toilet bowl.

The new toilet is a Grohe Euro Rimless and looking at the dimensions/tech sheet, it doesn't have any kind of U bend.

 

[just pumps]

Throw a bucket of water down the toilet if that clears the problem then call the installers back.