Ionizers, Chlorine Production, and When Manufacturers Won’t Listen

Pool Pros text questions here

In this episode of Mondays Down Under, Lee and Shane discuss a frustrating service case involving an ionizer sanitation system with an integrated salt cell that isn’t producing enough chlorine to maintain a residential pool.

The system is rated for pools up to 150,000 liters, yet the pool in question is only 60,000 liters and repeatedly turns green. Despite increasing runtime to 24 hours per day and raising output to nearly 100%, chlorine levels remain extremely low.

After performing a full troubleshooting process—including cleaning the pool, eliminating algae, verifying circulation, and treating potential biofilm with chlorine dioxide (C5)—the issue still persists.

Manufacturer Advice Raises Questions

When Shane contacted the manufacturer’s representative, the recommendation was to run the unit 24 hours a day at 100% output.

This raised several concerns:

• It dramatically increases electricity costs for the client.
• It may shorten cell lifespan.
• It could exceed the unit’s 10,000-hour warranty limit in just over a year.

Even more confusing, the representative suggested adding cyanuric acid, despite the system being marketed as a “freshwater pool system” and the manual specifically advising against adding stabilizer.

When Manuals and Advice Don’t Match

Lee and Shane point out the contradiction between manufacturer marketing, written instructions, and real-world recommendations. Being told to add chemicals that the manual says not to use places technicians in a difficult position if warranty issues arise later.

Lee stresses an important rule for service professionals:
 If a manufacturer instructs you to do something outside their manual, request the instructions in writing to protect yourself.

Not All Ionizers Are the Same

Shane also maintains another pool with a similar ionizer system from a different manufacturer that works perfectly, running 11 hours per day at about 80% output with no stabilizer in the water.

This comparison suggests the issue may not be ionization technology itself, but potentially a problem with the specific unit or controller.

Takeaway for Pool Pros

The discussion highlights an ongoing challenge in the industry: technicians often follow a careful process of elimination, only to be told the problem must be something else.

Sometimes, however, the problem is simply the equipment itself.

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