We have a problem with the kitchen sink that will not drain. Well it will, but only v e r y slowly. Have replaced the S bend and the fitting in the sink base itself: no fix though. If we remove all the pipes, the water drains from the sink just fine (into plastic bucket) - so the sink-fitting itself is clear.
Connect it all up up and back to slow drain again.
The drain pipe that goes through the floor is not blocked. Tried Mr Muscle down it just in case - but it didn't help. When the pipes are in place and we fill the sink, then pull the plug out, bubbles come up from the plug hole, but as I say, the water drains slowly again. I'm obviously not a plumber but cannot see what the problem is here. Seems to be air being sucked in somewhere and venting at the plug hole. This is not our place but it looks to me as if someone has replaced the S bend (or whatever was there before) with new plastic stuff - that then joints onto the grey pushfit pipe (1 ½ inch), I presume because of the slow-drain problem. So maybe something was wrong with the original setup. Appreciate some help - thanks.