Rotten egg smell is sulphur and iron in your well water. You can filter out the taste, odor, contaminants and iron by using a filtering system. Don’t disinfect your well if you have a filtering system already before calling and getting the proper steps to disinfect your well. Remember to turn off any water filtration system in your home before disinfecting your well. You might damage the media and resin in your tank. Read about iron and odor on this page. Check out why NASA engineered the technology and used this system on the space shuttle orbiter.