The answer is no and that is why Corro-Protec offers different models adapted to tank sizes.

If your water heater has two anodes, you can replace one of them with our Corro-Protec imposed current anode and leave the other one in place. Even if you install the Corro-Protec anode to eliminate the rotten egg smell in your hot water, you don’t need to remove the second magnesium anode.


  1. ken on April 24, 2021 at 4:01 pm

    What about an aluminum rod? My water heater has two aluminum rods, can I leave one in and install the powered rod in the other spot?

    • Corro-Protec on May 5, 2021 at 7:05 am

      Yes, the Corro-Protec can be installed with a magnesium, aluminium or zinc anode rod without any problem.

  2. Thor Collard on April 14, 2020 at 9:24 am

    Why is this the case? Don’t the bacteria still interact with the magnesium? Is this also the case if you have a water softener and two anodes?

    • Corro-Protec on April 14, 2020 at 9:55 am

      Hello Thor,

      If the smell came from the reaction between the magnesium rod and your water, our Corro-Protec anode will create a protection around the second magnesium anode rod that will stop this reaction.
      If the smell came from the bacteria, our Corro-Protec create an environment where the bacteria is not able to survive. Having a magnesium rod or not won’t make any difference.

      Hope this helps,

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