What can I do about periodic odors from my roof vents?

Hydrogen sulfide (rotten egg odor) is normal by-product of the sewage digestion process which occurs in the septic tank. Noxious odors from the septic tank my become obvious through roof vents on the house, depending on the house location and prevailing wind currents. To help alleviate the nuisance, extend the height of the roof vents.

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1. Will additives improve the efficiency of my septic tank?
2. Should I use special chemicals (e.g. detergents) or paper products that are considered better for the system?
3. What kinds of things should never be put into the system?
4. Will the use of a garbage disposal unit adversely affect the septic system?
5. What does the accumulation of lush green vegetation over my leach field indicate?
6. In order to reduce the load on my septic system, can I divert wastewater from my washing machine or other grey water fixtures?
7. What can I do about periodic odors from my roof vents?
8. How often should my septic tank be pumped?
9. How do I inspect my septic system myself? Or how do I know if my septic tank needs to be pumped?
10. I have an alternating drain field system. How often should I alternate my leach lines?
11. Why does my plumbing seem to become sluggish during winter months or when there is increase household water use?
12. Why does the septic tank need to be cleaned and pumped?
13. How can I locate my septic tank?