Liam wrote:
Redoing ground floor bathroom. At present I have three seperate waste
pipes for water softener, basin and bath all going to a gully outside.
Would it be possible to run just one waste pipe with two branches
joining it to the gully, or would it cause problems with syphoning?
Each waste would have its own trap. Water softener has a washing
macine type waste with trap. Total run is about 2 metres and it is a
single stack waste system.
Thanks everyone.

Also do not make the 'falls' too steep. 2.5 degrees is correct. Too
steep a fall will cause the water to travel too fast down the pipe and
will draw air behind it. Also make all traps 3" deep seal traps, (anti
syphon will help).