If I can just add my ha'penny worth, it may help, but probably not.🤔
Last month my pump would start up (pulsate) about every 5 seconds when all taps were closed, I narrowed it down to the flapper in one of the toilets, removed it and cleaned the calcium from the large rubber sealing ring and where it seated and it cured that problem. But now when a tap was turned on it would surge on and off in about 1 second intervals, so took the bladder tank off and drained it, then replaced it and it cured that problem. I wonder what the next problem will be?🤔