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What is wrong with my redring expressions 5005?

My shower had been getting colder over a period of a few years. A hot shower used to be medium setting on 6, over time it has had to be turned up to 7,then 8 and now 9.
At cold the pressure is good , but at 9 the pressure
Is low.
I’d appreciate any information.
Thank you
Clare Gibbons, January 2021
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