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Homeowner here - I've got 2 mains running the length of my 2000sqft house with Gorton D on the end. My plumber casually mentioned he didn't think they were working as he left the house recently and suggested I replace them. I'm happy to do so, but I was trying to figure out how I might know if they are working or not. Is there an easy test? Is it just a listen for some kind of hissing? How loud should it be?