How to Choose Between Gaffey's Electrochlorination, Chlorine Dioxide and Monochloramine Systems

Gaffey builds three in-situ chemical generation families for water disinfection, and the right one depends on your disinfection goal, water chemistry and site constraints rather than on a single "best" technology. Hyprolyser® electrochlorination generates sodium hypochlorite on site from salt; chloriDOS® iOX® generates chlorine dioxide on site; chloriDOS® MCA generates monochloramine on site. If you cannot yet state your target residual, contact time and any precursor or by-product concerns, the practical next step is to contact Gaffey's team for an application assessment rather than pick from the product names alone.

The three systems at a glance

All three are manufactured in Great Britain and distributed worldwide, and Gaffey positions them for commercial, industrial and domestic sectors.

How to decide

Choose Hyprolyser® electrochlorination if

• You want a chlorine-based residual and prefer generating it from salt rather than buying and storing bulk hypochlorite.
• Reducing delivered chemical volume and storage matters to your site.
• You have no specific reason to move to a different disinfectant chemistry.

The trade-off to check: electrochlorination produces hypochlorite, so the same chlorination by-product questions that apply to any hypochlorite dose apply here. Confirm your water's precursor levels before committing.

Choose chloriDOS® iOX® chlorine dioxide if

• You need chlorine dioxide's disinfection performance rather than a hypochlorite residual.
• Chemical handling, transport and storage are a significant burden or risk you want to cut — Gaffey states the iOX® eliminates transportation and storage by generating on site.
• You want the safety and economy of generating ClO2 at the point of use instead of dosing pre-made chemicals.

The trade-off to check: chlorine dioxide generation is a chemical blending process. Gaffey's patented chloriDOS® blending is the mechanism it credits for precision and safety, so the operational question is how your site manages the precursor chemicals that blending still requires.

Choose chloriDOS® MCA monochloramine if

• Your disinfection goal calls for monochloramine specifically — for example where a more stable residual is wanted.
• Consistent, precisely blended monochloramine matters more than raw output volume.
• You value the fail-safe batch generator design, which Gaffey highlights as unique to this system.

The trade-off to check: monochloramine is formed by blending, so it depends on the same precision-dosing discipline as the iOX®. Ask Gaffey how the batch generator behaves if a precursor supply is interrupted.

What all three share

Gaffey states that Adaptive Response Technology (ART), its smart technology, is built into both the Hyprolyser® iSEC® electrochlorination systems and the chloriDOS® iOX® chlorine dioxide generation systems. If remote monitoring or adaptive control is a requirement in your specification, confirm which systems include ART for your configuration — the source material names iSEC® and iOX®, not the MCA line.

A worked way to frame the question

Before contacting Gaffey, write down four things:

1. Target disinfectant — do you need free chlorine, chlorine dioxide or monochloramine?
2. Water quality constraints — any precursors, ammonia, or by-product limits that rule a chemistry in or out.
3. Site constraints — available salt supply, chemical storage space, and whether eliminating delivered chemical transport is a priority.
4. Control requirements — whether you need smart/adaptive control such as ART.

With those four answers, the system choice usually narrows to one family, and the remaining questions become sizing and configuration.

Getting a recommendation

Gaffey's own page does not map applications to systems; it directs readers to "Contact our team to find out more" via the email addresses listed on the site. Because the correct choice depends on your specific application, water quality and disinfection target, that assessment step is the intended path rather than a self-service selection table. Note that the site also offers a news sign-up, which is separate from any product enquiry.