First, find where the smell comes from
The Florida Department of Health says hydrogen sulfide can occur in wells anywhere in Florida, and that sulfur bacteria are not harmful and the smell usually does not relate to how clean the well water is. Its fact sheet gives a simple faucet test:
- Only hot water smells: the problem is likely in the water heater. Penn State Extension notes a magnesium anode rod can react with sulfate; a different anode is often the fix, not a filter.
- Only softened water smells: likely sulfur bacteria in the softener.
- Strong at first, fades as water runs: likely sulfur bacteria in the well or plumbing.
- Strong and constant on hot and cold: likely hydrogen sulfide in the groundwater. This is where aeration or filtration comes in.
FDOH still recommends testing a private well for total coliform and E. coli regularly, since odor tells you nothing about bacteria.
Side-by-side comparison
| Factor | Aeration | Activated carbon | Oxidizing filter |
|---|---|---|---|
| What it does | Mixes air into the water so the gas escapes and is vented outside | Adsorbs odor compounds on carbon | Converts hydrogen sulfide into sulfur particles and traps them in the media |
| Best for | Moderate, steady odors at whole-house flow | Light odors, or polishing after aeration | Light to moderate odors, often with iron or manganese present |
| Maintenance | Low; vent and air components need checks | Carbon is used up and must be replaced, more often at higher levels | Regular backwashing; some media need regeneration or chemical feed |
| Space | Tank or tanks plus a vent route | Small to medium tank or cartridge | Tank with a drain for backwash |
| Ongoing cost factors | Electricity for pump or air injection, occasional service | Frequent media or cartridge replacement | Backwash water, regenerant or media replacement |
What the extension guidance says
Penn State Extension matches treatment to concentration. In short:
- Low levels: activated carbon can work, but the carbon needs periodic replacement.
- Moderate levels: oxidizing filters such as manganese greensand, with regular backwashing and regeneration, or aeration, which has low upkeep once installed.
- High levels: continuous chlorination or another oxidant with filtration afterward, which takes more maintenance.
Shock chlorinating the well can knock back sulfur bacteria but usually gives only temporary relief. Aeration alone may not get odor to zero, which is why a carbon stage after aeration is a common pairing.
Why testing beats guessing
Hydrogen sulfide escapes from water quickly, so a sample needs to be measured on site or preserved for a lab. Penn State notes the nose detects it at very low levels. The level, plus iron, manganese and pH, decides which system will hold up. Choosing by smell alone often leads to carbon that gets used up quickly, or an aerator where a heater anode was the real cause.
Which should you choose?
- Hot water only? Look at the water heater first.
- Light, steady odor: carbon or an oxidizing filter.
- Moderate to strong odor: aeration, often followed by carbon, or an oxidizing filter sized for the level.
- Very strong odor: an oxidant feed with filtration.
Living Water configures well water treatment from the well's test. Start with Jorge's free in-home water test. Call, text or WhatsApp (305) 793-5974.
https://www.floridahealth.gov/wp-content/uploads/2025/08/well-water-facts-odor-staining.pdf
https://extension.psu.edu/hydrogen-sulfide-rotten-egg-odor-in-water-wells
https://hgic.clemson.edu/factsheet/residential-drinking-water-well-water-treatment-options-3rd-in-series/
https://www.floridahealth.gov/community-environmental-public-health/environmental-public-health/water-quality/drinking-water/private-wells/
Updated 2026-10-17 · Living Waters · Jorge Canela, Water Quality Specialist