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Commercial Iron and Sediment Filters
Well-sourced commercial water commonly contains iron, manganese, hydrogen sulfide, and sediment that must be addressed before water reaches softeners, RO systems, or point-of-use equipment. Iron staining, sulfur odor, and sediment damage are among the most common water quality problems in rural commercial facilities and industrial operations on private wells.
Iron removal — choosing the right method
Iron exists in two forms that require different treatment approaches:
- Ferrous (clear water) iron — Dissolved iron that is invisible in solution but precipitates as rust on contact with oxygen. Most common in well water. Treated effectively with air injection oxidation at concentrations up to 7 PPM, or peroxide injection at higher concentrations.
- Ferric (red water) iron — Already oxidized, visible as rust particles. Removed by mechanical filtration with appropriate media. Often present alongside ferrous iron.
Iron concentration thresholds by treatment method:
- Under 3 PPM: Air injection with oxidizing filter media typically sufficient
- 3–7 PPM: Air injection with higher-capacity media, or birm/greensand systems
- 7+ PPM: Peroxide injection (hydrogen peroxide oxidation) required for reliable removal
- With H2S present: Peroxide injection handles both iron and sulfur simultaneously
Hydrogen sulfide (sulfur) removal
Hydrogen sulfide produces the characteristic "rotten egg" odor in well water. At low concentrations (under 1 PPM), aeration or carbon filtration may be sufficient. At commercial flow rates with higher concentrations, peroxide injection is the most reliable method — it oxidizes H2S rapidly and the reaction byproduct (sulfur) is then filtered out.
Manganese
Manganese causes black or brownish staining and is common in well water alongside iron. Standard iron filters are less effective at manganese removal. Greensand filtration (potassium permanganate regenerated media) is specifically designed for manganese and is the preferred treatment when manganese is the primary concern or is present alongside iron.
Sediment filtration
Sand, silt, and particulates must be removed before iron filtration and RO to protect downstream media and membranes. Spin-down sediment filters handle coarse particles (100+ micron) with minimal maintenance. Cartridge filters at 5–50 micron address finer sediment. For high-sediment-load well water, a multi-stage pre-treatment sequence is standard: spin-down → sediment cartridge → iron removal → softener or RO.
Recommended systems
- US Water Systems Matrixx InFusion — Peroxide injection system for high-iron (7+ PPM) and simultaneous iron/sulfur applications at commercial flow rates.