mtagrant wrote:
Thanks.....was the descaling difficult and something you need a
professional in to do, or can most people do it themselves?


I drained the whole system and just did the boiler with Furnox abt 14
years ago which took around ten boiler-fulls of concentrated solution.
The Furnox residue in the boiler probably cleared the rest of the system
when it was refilled. I think they only do whole-system descaler these
days which should be even better for the pump.

The water in this part of Essex is extremely hard. Tap spouts get
completely choked after ten years, so your problem might be something
else if the water's not so hard. You could always take the pump off and
have a look.

john2