Nelsen Control Flow Air-Injection (AIO) Sulfur Filter

NWS Control-Flow air-injection sulfur system

This system pairs the Nelsen Water Solutions Control-Flow valve with air-injection oxidation to banish the rotten-egg hydrogen-sulfide odor that makes well water unpleasant to drink, cook with, and shower in — all without chemicals.

Is sulfur your problem?

A rotten-egg smell that is strongest in hot water or after periods of no use points to hydrogen sulfide. It is more than a nuisance: sulfide is mildly corrosive, can tarnish metal, and often accompanies iron, compounding staining problems. Removing it makes an immediate, noticeable difference at every faucet in the house.

How it clears the smell

Incoming water passes through a pocket of air held at the top of the treatment tank, where the dissolved sulfide gas is oxidized into a solid that the media bed filters out. The Control-Flow valve then backwashes the bed and draws a fresh charge of air automatically, keeping odor removal consistent day after day with no feed pump or chemical to manage.

Designed for hands-off ownership

• No chemical dosing to refill or calibrate.
• Programmable, self-renewing backwash from the Control-Flow head.
• Single-tank layout for a cleaner installation.
• Odor gone house-wide — showers, sinks, and appliances.

Sulfur and iron often occur together, and this platform suits both; where hardness or acidity are also present, we will stage the treatment appropriately. The system installs on the main line with a backwash drain and a standard outlet for the valve. Send us your well test and we will confirm the configuration, size it to your flow, and ship it free in the US with manuals and expert help.

Support and sizing

Getting sulfur removal right is about matching contact time to your flow, which is why we size every system to the household rather than selling a one-size unit. Send your water test and peak demand, and we will confirm the capacity, program the Control-Flow valve for your conditions, and remain on hand for any questions after it is installed.

With free US shipping, factory manuals, and a team that works with these systems every day, you can order with confidence and have fresh, odor-free water running throughout your home in short order.