Sink drainage issues

[steveg1979]

Ok so I have taken all pipes apart and cleaned them and removed blockages, but when I run even the smallest amount of water it remains in the trap and backs up the sink.

How can this be a blockage further down the pipes if after the trap those pipes are clear?

Any advice please I am out of ideas.

 

[galaxy_plumbing]

sounds like blockage down the line. you can try wet vac and suck if there is something in or strong chemical (shift it!) if this is a build up of fats etc in the pipe. can you access pipe from other end?

 

[lame plumber]

if it dont go away its blocked somewhere

 

[BN9Pete]

If you can access the rest of the waste pipe and the pipe is old cut it out and fit a new pipe, I have tried to unblock kitchen waste pipes and some of them are totally clogged up, obviously removing a waste pipe that runs behind units is a difficult job.