thanks to all will check over again at weekendHi Terrence,
While Metz is correct, we do not use carbon type removable filters, there is a mesh filter, on the inlet side of the pump. During winterisation, we advise that the inlet and outlet pipes of the pump are removed, and the pump is run dry for a short time.
You can also remove this mesh filter, to ensure no water is trapped inside the housing, although running the pump dry should remove any water trapped in the filter.
Thanks,
Ash