No, a water hammer will never go away on its own. Because it is a mechanical issue driven by fluid momentum, high water pressure, and closed valve dynamics, the underlying physical cause remains until corrected. Ignoring water hammer means the violent hydraulic shock waves will continue every time faucets or appliances shut off, gradually fatiguing pipe walls and loosening fittings until a catastrophic leak or joint separation occurs. Verification: Install mechanical water hammer arrestors or adjust household water pressure to eliminate the knocking permanently.
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