On Wed, 07 Mar 2007 12:35:36 +0000, David Hansen
wrote:

On Wed, 07 Mar 2007 11:00:15 +0000 someone who may be Stuart B
wrote this:-

The very small hole is to allow air to escape so the siphon fills (otherwise
it wouldn't). Once full it flushes the toilet, the small hole not being
enough to break the siphon. This empties the cistern as per normal and the
cycle repeats. It should thus be able to deal with at least a cictern
filling permanently at its normal full rate.

Unless the waste pipe blocks at the same time in which case you are in
the S*** ....That was the advantage of seperate overflows to outside
...Unlikely I agree tho'

However, a dripping warning pipe in winter can slowly freeze solid,
with predictable results, so it is a matter of swings and
roundabouts.

Freezing winters ..Nah..That was years ago .haven't you heard of
global warming ..lol?