The time required for water to stop smelling like sulfur depends on the remediation method used. If you flush your water heater tank and chlorinate the system, the rotten egg odor often disappears within 24 to 48 hours. However, if the sulfur smell is caused by a chemical reaction with a standard magnesium anode rod, the odor will persist until you permanently replace the magnesium rod with a zinc-aluminum anode rod. Verification: Run your hot water taps continuously for several minutes after remediation to confirm the sulfur smell is gone.
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