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We have an Aqualisa Quartz shower that was installed three years ago. Recently, the pressure seems to be lower than it used to be, and you can almost feel it starting to splutter. We descaled the shower head and have also followed advice on the Aqualisa FAQs to run the shower cold and gradually increase the temperature to clear any trapped air, but this has not made a difference. Does anyone know what this could be? Do Aqualisas need new cartridges every few years? Would be grateful for thoughts and advice!