On Wed, 07 Jun 2006 15:05:32 GMT, Speedy Jim wrote:

wrote:
wrote:

I have a strange problem that has just started on one of my toilets. It
is located on the first floor of my house has it's own stand pipe. When
the toilet is flushed, the siphon action is too strong. At the end of
the flush, there is next to no water left in the trap in the bowl. This
is soon followed by some air gurgling back into the bowl.
snip

Not an air leak, but rather a venting problem (IMHO).

It may not be a complete blockage of the vent (to roof);
it could be a partial blockage where the closet bend
enters the San TEE.

Washdown closet bowl depends upon siphon action to
pull waste out of bowl, but the siphon *must* be
broken near end of the flush so as not to empty
the bowl trap completely.

As a first step, maybe try a closet auger to get
any blockage out of the closet bend. After that,
run water down the roof vent terminal or drop
a snake down. If you run water into it, have
someone standby inside the house to watch for
any water overflow from fixtures.

I think I have that type of problem in my bathroom, though not to that
extent (water level in the toilet drops, sometimes, not always;
sometimes a very strong flush with a choking sound following).

I can't do roof work myself. Is this kind of thing a routine job for
a plumber? Or is it expensive?

TIA.

Sue(tm)
Lead me not into temptation... I can find it myself!