wrote in message
...
I have a problem with improving the rate at which our newly installed
bath drains. The old one was just as bad, the difficulty is the poor
design of the original installation which I am rather stuck with.

The bath is in a flat and is positioned about two or three meters from
the main service duct where the sewage downpipe is. The waste pipe
from the bath runs essentially horizontally from the trap under the
bath across to the downpipe. Not surprisingly, especially towards the
end, it drains very slowly. It's impossible to get at the connection
of the waste into the downpipe as it's inside a brick built service
duct, all you can get at is a 40mm 'socket' where it pokes through a
hole in the brickwork.

Can anyone suggest any clever ways to improve this? It'll be quite
difficult to do anything much about the drop in the pipe although
there is currently access from below (the kitchen) as the leaks from
the old bath and drain have caused a bit of the kitchen ceiling to
collapse. However even if we took the pipe down through the ceiling I
can't see how it could then be routed to the service duct without
major building work. I suppose it could join the waste pipe from the
kitchen sink but how would you prevent water 'welling up' into the
sink?

Is pumped waste possible? Are one-way valves for waste pipe
available?

The washbasin waste pipe is even worse, it has a near horizontal run
of four meters or so and the same difficulties of improving the drop
apply. It could run into the bath waste and gain some drop that way
but, again, how do you stop it coming up into the bath?


Chris Green )

What size is the waste connection at the outlet for the kitchen system ? If
you have a 50mm out flow from the kitchen, then you can combine both the
bathroom and kitchen to the one outlet, and then cap the old bathroom waste
at the service duct. But this can only be done if the kitchen out flow is
50mm at the outlet to the main stack.