I have a Mira 723 thermostatic mixer shower that has to be dismantled/descaled/lubricated at least once a year, due to the fairly hard water in this area. It's a fiddly job and I'm seriously considering replacing the control with a ceramic valve type. Unfortunately there is no direct drop-in replacement so this would involve quite a bit of work.
Hence the question: Has anyone good or bad experiences with ceramic plate valve shower controls in hard water areas? The Mira Excel (if it's still available) claims it 'resists scale build up'. Is this a get-out clause or are they just covering themselves?
Thanks in advance.