Probably only a leak I'd say!
Sounds a bit drastic to me. If the water is really that hard, maybe some
way to make it less so might be a good idea. . How many years has it taken
to be noticeable?
Brian

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The Sofa of Brian Gaff...

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The flow to my bath has dwindled over the years, it's a conventional
vented cylinder and 3/4" copper pipes, is there likely to be any
benefit in dosing the cold water tank with sulphamic acid and then
recirculating through the bath tap connection with a pump?

AJH