A toilet that makes loud whistling, groaning, or hammering noises while refilling is usually experiencing high water pressure, a worn-out fill valve seal, mineral scale buildup inside the valve, or a partially closed water supply valve. When water rushes past a restricted valve opening or worn internal washer, it creates high-frequency vibrations in the pipes. Additionally, old metal supply lines or loose internal valve parts can amplify these acoustic vibrations into loud plumbing noises. Verification: Adjust the wall shutoff valve or service the fill valve internal seal to restore quiet operation during tank refills.
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