"david lang" wrote in message
. uk...
sPoNiX wrote:
Currently taking the CH apart and updating various things. The system
and pipework are over 30 years old and we live in a very hard water
area.

You can check your water hardness by entering your post code into a box on
www.calgon.com I have checked this with areas I know to be hard & softa
water and it hasn't failed yet.

snip

If you check your local water co website it will tell you the hardness of
your water without bias ( they have no product to sell )

Regards Jeff

Regards Jeff