Powerpoint should say ground floor. Spirotrap is solid brass and doesn't leak. It doesn't need to be dismantled to clean it. Removes non magnetic particles as well as ferouse ones.
A flush is a good starting point. It is a common cause for noise and slow heat up. Did you take a water sample? Drain about 2 or 3 litres from a drain cock on the ground floor then take a sample in a tall glass. Sink an o ring in the glass. If you can't see it through the water you definitely need a flush, if you can you probably need one. Sounds silly but can be positive proof. This is called a turbidity test. Normally done with a calibrated tube but in a recession we need to improvise. You can get a test kit. Take a sample and send it off. They will analyse the sample and send the results. I would just flush and see, as a clean system is always a good thing. Have you removed the pump head and inspected it? May have some debris caught in it.
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