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Ranger42c: You probably should not have any major concerns in regards to your marina being on a well. If there are over 15 service connections they should be required to obtain a permit to operate with all the controls, inspections, testing, and monitoring that go with the permit. Exactly like a municipal system would be required to operate.
Fryedaze: Yes, carbon filters may collect sulfates that in turn allow a home for reducing bacteria (not necessarily "bad" bacteria) to begin working on the sulfates and thereby creating the smell. It may certainly be coming from other things also. Do you notice it more in the hot water side of the system ? If so it could be the natural working of the magnesium rod in your water heater. You did not mention the source of your water surface water treatment plant, private well, etc.. That will make a difference on the O2 that is used to reduce the H2S04.
Fryedaze: Yes, carbon filters may collect sulfates that in turn allow a home for reducing bacteria (not necessarily "bad" bacteria) to begin working on the sulfates and thereby creating the smell. It may certainly be coming from other things also. Do you notice it more in the hot water side of the system ? If so it could be the natural working of the magnesium rod in your water heater. You did not mention the source of your water surface water treatment plant, private well, etc.. That will make a difference on the O2 that is used to reduce the H2S04.