Why staining and rotten-egg odor so often appear together, and why a carbon filter alone rarely holds.
Iron and hydrogen sulfide are two of the most common findings on Florida wells. Iron shows itself visually through staining; sulfide announces itself through smell.
Both are frequently dissolved rather than suspended, which is the key point. A filter can only capture something it can physically trap, so dissolved contaminants have to be converted to a solid form first.
That is what oxidation does. Air injection or a chemical oxidizer converts dissolved iron or sulfide into particles a media bed can capture and then backwash to drain.
Skipping that step is the most common reason an odor treatment works for a few weeks and then stops. Sizing the oxidation and filtration to a measured concentration is what makes the result durable.
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