Hi all. I installed a sanishower in my en-suite about two years ago, but lately it is reluctant to take the water out at a reasonable rate, and although still working, the tray is filling faster than the water is discharging. Has anyone had experience of this type of problem - is it just a clean-out or is there a quick fix using a cleaner/descaler as it is an absolute t**t to access after everything has been re-built around it, plinth, flooring etc. Any advice would be much appreciated