Slow Drainage

[Fitzkeith]

Just removed a sink and all pipework from a bedroom. The sink drained into the bath's outflow which is on the adjoining wall. I've capped the connection where the sink's drainpipe met the bath's. The consequence of this has been to make the bath drain very slowly.

To accomodate the drain pipe from the sink the bath's pipework drained back for about 30cms before going through four 90 degree bends to discharge through outside wall into pipe that's about 2m from the trough of its downpipe. Prior to this the bath seemed to drain OK.

Moving the bath's drain pipe to point forward, removing all the bends, is currently impractical. Would a vent instead of a cap on the old sink drain pipe improve matters.

Any suggestions?
Thanks

 

[ChrisR]

I was thinking vent as I was reading. You'd need an upstand of pipe to be above the bath fill level.

Try some drain cleaner down there, which willdissolve hair etc if it's an aggressive one.

Almost as good is a large saucepanful of boiling water.