To understand where the smell comes from, we need to understand the relationship between the Hydrogen Sulphide and Sulphates which are a combination of sulphur and oxygen and are a part of the naturally occurring minerals in some soil and rock formations that contain groundwater. The Sulphates dissolve over time and are released into the groundwater.
         Anaerobic bacteria live in oxygen-deficient environments such as in deep wells. Iron bacteria and sulphur-reducing bacteria both thrive in these types of surroundings provided they have an energy supply. The Sulphur-reducing bacteria, which use sulphur as an energy source, are the primary producers of large quantities of hydrogen sulphide. These bacteria chemically change natural sulphates in water to hydrogen sulphide. The Iron bacteria, live on Iron and Manganese and produce a brownish slime if their intake is Iron and a blackish slime if it’s Manganese, this slime has a tendency to block up pipes.

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