Neutralizing a rotten egg odor depends on whether the smell stems from plumbing gas or water chemistry. To eliminate sulfur smells in water heaters, you can flush the tank thoroughly, chlorinate the system, or replace the magnesium anode rod with a zinc-aluminum anode rod, which stops the chemical reaction producing hydrogen sulfide gas. To neutralize sewer gas odors caused by dried-out plumbing, simply pour water down all unused sink, shower, and floor drain P-traps to restore the liquid barrier. For gas odors, shut off supply valves immediately. Verification: Confirm that running water and replacing anode rods successfully clears the foul sulfur scent.
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