I have a Hudson Reed shower, about 7 years old
A lot like this
http://www.ultra-group.co.uk/product...productid=1821

The temperature control has become very stiff.
It appears that the themostatic control valve is the problem.
I have opened it all up and found the cartridge, which appears to be
an SA30039, like this
http://www.ergonomicdesigns.co.uk/SA...rtridge.htm l

A local plumbing shop I tried suggested removing it and soaking in
Soda Crystals (presumablt to try to reduce limescale build up)
That helped a little, but not much

So my next stage is to consider an active acid based descaler. Is this
a good idea?
Or is it posble to dimantle it further and manual clean it?

Or does anyone have any better advice? The valve itself still works,
but as it stands I am the only one in the house strong enough to turn
it.