The fourth floor flat we recently moved into has a very slow draining sink.
The sink trap and the initial plastic pipe is clear. A plumber we had doing
another job pumped some air into the pipe with minimal effect he said that a
blockage/gunge must be building up where the plastic pipe joins to a metal
pipe that joins the communal down pipe in the pantry. To get to where the
pipes connect he would have to take out the unit next to the sink and I want
to avoid that.
Is there anything safe to pour down the sink that will reach that part to
The extra caustic soda that goes down the drain will hopefully dissolve some
or all of the gunge in the process. The caustic soda that stays in the trap
will flush away when you next turn a tap on. It can produce fumes so just
put the plug in while you are waiting for the caustic soda solution to work.
Did he use a Power Plumber aerosol thingy? I bought one of these from B&Q a
couple of years ago for just the same problem - gunge out of reach. It's
quite intense and spectacular, and I've never had the problem again.
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