On 12 Mar 2006 13:53:36 -0800, "Alister21"
wrote:

Excuse my ignorance lads but please explain 'pump over' / its causes /
its cure.

Thanks for all replies to date.
Al.



See other post.

Basically it normally results from the pressure head between the FE
and vent pipes being too high because they are wrongly positioned.
However, there are scenarios where other places can be under negative
pressure as you have seen.


--

..andy