Hi,
I have a problem when my Washing machine drains the dirty water fills up the sink. It never used to do this so I figgured there is a blockage somewhere that is making things difficult to drain. But I have checked the U bend which is now clear and also checked any other pipes that are related. I also have the same problem the other way round. as in when i empty the sinnk my washing machine fills up with water.
Any ideas?