"geoff" wrote in message ...


Can anyone give me a bleedingly obvious reason why two identical WCs
with maybe a metre difference in head are performing so differently?

The higher one seems to suck like a ... , and leaves only just enough
water to cover the "S" bend. The other one circulates and leaves a
normal amount of water in the pan

I don't actually want to get too involved (for obvious reasons0 but can
anyone give a few pointers as to why the first seems to have an over
active syphon?


I suggest a descale..... inlet and outlet.