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How To Water pump knocking

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Depends on the pump. And what you think is a knock.
 
I added a 1 gal expansion tank on the output side of the pump. Solved a pump cycling concern which was noise, providing more even water flow and greatly improved the cold/hot cold/hot shower temperature. Made it much more enjoyable to shower as the temperature didn't change. But still, I can hear the pump going on and off.
 

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