The short answer
- Clear water that turns orange in the bucket is dissolved ferrous iron; already-orange water is oxidized or bacterial.
- Rotten-egg odor is hydrogen sulfide — if it's only on hot water, suspect the water heater anode rod.
- Oxidation plus filtration handles most iron and sulfur; a softener alone is not an iron filter.
- Treatment order is sediment, then oxidizing filter, then softener, then UV if bacteria is present.
Identify what you have before you buy anything
- Clear water, orange stain later — dissolved ferrous iron, the most common type
- Orange or red water straight from the tap — already-oxidized ferric iron or rust from pipes
- Slimy reddish sludge in the toilet tank — iron bacteria, which needs shock chlorination first
- Rotten-egg smell on hot water only — hydrogen sulfide reacting with the heater's anode rod
- Rotten-egg smell on hot and cold — hydrogen sulfide in the well itself
Treating iron
Dissolved iron has to be oxidized into a particle before it can be filtered. Air injection systems draw a pocket of air into the tank, oxidize the iron as water passes through, and trap the particles in a filter media bed that backwashes to drain — no chemicals to refill.
For lower iron levels a manganese-greensand or catalytic media filter often does the job. A softener can remove a small amount of iron incidentally, but running meaningful iron through resin fouls it and shortens its life. Iron gets its own stage.
Treating sulfur odor
Hydrogen sulfide responds to the same oxidation-plus-filtration approach as iron, which is why one properly sized air-injection system usually solves both at once. Heavier concentrations may call for chemical oxidation with a contact tank ahead of the filter.
If the smell is only on hot water, the fix is often much simpler — replacing a magnesium anode rod with aluminum or zinc, then sanitizing the tank.
The right order of treatment
- Sediment pre-filtration for sand and grit from the well
- Oxidizing iron and sulfur filter
- Water softener for hardness, now protected from iron fouling
- UV disinfection if a bacteria test comes back positive
- Reverse osmosis at the kitchen sink for drinking and cooking
Testing and maintenance
Well owners are responsible for their own water quality, so test annually for bacteria and nitrate, and any time the taste, smell or color changes. We test iron, hardness, pH and hydrogen sulfide before we quote, because pH drives which media will actually work.
We build and service well treatment systems throughout Oakland, Macomb, Livingston & Wayne County, Michigan. Send us your water concerns and we'll come back with a written recommendation.