AIO-CFM-NWS15-24

The AIO-CFM-NWS15-24 from Water Softener Plus is a Nelsen Water Solutions NWS15 air-injection iron filter built on a durable 24 x 72 composite mineral tank with a 1-1/2" backwash control. Air-injection oxidation (AIO) filtration is a popular, chemical-free approach to removing iron, and often manganese and hydrogen sulfide odor, from well water, making it a practical choice for households fighting rust stains and metallic taste.

How air-injection filtration works

An AIO system maintains a pocket of air at the top of the media bed. As water passes through, dissolved iron is oxidized into a solid, filterable form that the media then traps. During the periodic backwash cycle, the system flushes the captured iron to drain and replenishes the air pocket, all without the need for added chemicals, potassium feed, or separate oxidant injection. That self-contained, chemical-free operation keeps ongoing maintenance simple and avoids the handling and cost of treatment chemicals.

• Nelsen Water Solutions NWS15 air-injection (AIO) iron filter
• Large 24 x 72 composite mineral tank
• 1-1/2" backwash-only control valve
• Chemical-free oxidation and filtration of iron
• Helps address iron staining and associated odor on well water
• High-flow design suited to demanding residential and light-commercial use

This is a backwash-only configuration, meaning it cleans the media bed on a regeneration cycle rather than dispensing brine the way a softener does, so there is no salt to refill for the filter itself. The generous 24 x 72 tank paired with the 1-1/2" valve makes it well suited to higher-flow homes where smaller filters would struggle to keep up. As with any iron filter, a recent water test confirming iron and manganese levels along with overall water chemistry helps ensure correct setup, and periodic backwashing keeps the media performing. For well-water households battling rust stains and metallic taste, this Nelsen AIO filter is an effective, low-maintenance solution.

Iron in well water is more than a cosmetic nuisance: it stains fixtures and laundry a rusty orange, builds up inside plumbing and appliances, and can foul a downstream softener resin bed if left untreated. Placing an iron filter ahead of a softener protects that investment and tackles the staining at its source. For homes drawing from a well with measurable iron, this kind of air-injection filter is often the foundation of an effective whole-house treatment train, and a water test guides correct setup.