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The most common reason of this sulfur smell in hot water is the presence of a bacterium called Sulphate-Reducing Bacterium.

This bacterium loves hot water and hard water, which is why it is often found in homes that have a water softener and a water heater[1].

There are some ways to solve odor problems. As a temporary solution, you can do a treatment called chlorine bleach. This treatment should eliminate odors for a few months, but you will be forced to do so at intervals of 3 to 6 months.

A longer term solution would be an imposed current anode. The current sent by the titanium anode will kill the bacteria. [2]

  1. https://water-research.net/index.php/sulfates
  2. https://www.corroprotec.com/blog/sulfur-smell-in-hot-water/
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