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Certain water conditions will cause a reaction between this rod and the water. The most common comg!aint associated with the anode rod is oneof a rotten egg smell. This odor is derived from hydrogen sulfide gas dissolved in the water. The smell is the result of tour factors which must all be present for the odor to develop: a. a concentration of sulfate in the supply water. b. little or no dissolved oxygen in the water. c. a sulfate reducing bacteria within the water heater. (This harmless bacte