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Why Does Your Hot Water Smell Like Rotten Eggs?

Plumbing and water treatment companies often face many complaints about odors in hot water. It must be known that this phenomenon is often present in well water. If your hot and cold water smells like rotten eggs, the smell is usually caused by the levels of sulfur bacteria and Hydrogen Sulfide that can be found in the water. If the smell is present only when you use hot water, it may be a chemical reaction inside your water heater instead of a water supply problem.

What causes this reaction in the water heater?

Each water heater is manufactured with a magnesium anode to temporarily limit rust. In most cases, the sulfur odor is caused by high magnesium water that comes into contact with the original anode already present in the water heater. In addition, this odor could be created by bacteria (sulfur bacteria). If the odor problem comes from the reaction between the magnesium anode and your water, several options are available for you. However, it is important to know that these options are not all good in the long run.

Here are the 3 options available to you:

– First, it would be possible to stop these odors by completely removing the original magnesium anode in the tank. However, doing so is dangerous for the water heater because it has been deprived of its only rust protection. The weaker and more exposed places will then rust faster.

– It is also possible to change the magnesium anode by an aluminum anode. Water will no longer react with the new anode and odors should disappear. However, in most cases, the aluminum anode require more maintenance and could cause other problems.

– Finally, an imposed current anode such as CORRO-PROTEC titanium anodes are the ideal solution to these problems, because in addition to eliminating odors in a few hours, the CORRO-PROTEC anode stops corrosion inside of the tank and is guaranteed for 20 years, so you no longer have to worry about the rotten egg smells ever again.


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  1. Susan Brown on March 14, 2019 at 11:59 am

    I had fixed my odor problem with an aluminum rod a few years ago, but I have hard water issues, and its led me to replace the anode too often. We are happy to have found a long term solution

    • Anna Beard on May 16, 2019 at 5:41 pm

      Exactly how did you fix the odors with an aluminium rod?

      • Corro-Protec on May 16, 2019 at 5:48 pm

        The aluminum anode does not really eliminate odors.

        By removing the magnesium anode already present in your tank, the chemical reaction between the magnesium anode and your hot water will no longer continue and the odors should stop. We tell customer to replace the magnesium anode with a aluminium or a titanium anode because It is very important to have protection against corrosion in your water heater! Take note that the magnesium anode is not the only factor that can create odors. Powered titanium anode is the ultimate solution to cancel all rotten egg smell in hot water.

  2. Arnold on February 20, 2019 at 10:21 am

    We also have odor problems, but they are present in cold water and in hot water. However, it looks like it’s amplified in hot water.
    Could an anode like yours solve this problem?

    • Corro-Protec on February 27, 2019 at 1:31 pm

      Yes, the smell in your hot water will no longer be amplified.

  3. Mark on February 9, 2019 at 11:49 pm

    Interesting! My neighbor advised me to simply remove the magnesium anode… I will continue my research because it doesn’t seem to be a very good advice from him. Does your product work every time for water odors?

    • Corro-Protec on February 11, 2019 at 9:10 am

      Yes it will! If not, we have a 90 Day Money Back Guarantee!

  4. John Rickwood on February 2, 2019 at 11:22 am

    Thanks! No more smell in our hot water few hours after the installation.

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