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What is ozone and what does it do?

Ozone is a form of oxygen that contains three atoms (O3) rather than the normal two (O2). Ozone acts as an oxidizer and disinfectant (sanitizer) in the pool. Prozone equipment is designed primarily to provide oxidation and some disinfection of the water. Ozone is the most powerful oxidant and disinfectant readily available.

What is oxidation?

Oxidation is the process by which bather load (contaminants) are removed from the water. Ozone reacts with bather load and the result of the reaction is filterable precipitants.

Why is oxidation important?

Most chlorine introduced into a pool is used up in oxidation reactions with bather load. These reactions result in combined chlorines which are the source of odors and irritation.

The removal of bather load is important for several reasons:

  • Bather loading reduces water quality and clarity
  • Bather load neutralizes chlorine (ie combined chlorine is formed, combined chlorine is a poor sanitizer)
  • Bather load provides nutrients (food) for bacteria and algae.
  • Bather load can provide protective coatings to bacteria and viruses, making them harder to kill.

Ozone reduces bather loading which in turn reduces chlorine usage. Most chlorine is normally used up in reactions with bather load so its removal by ozone substantially reduces the amount of chlorine required.

What is disinfection?

Disinfection is the process by which bacteria and viruses are inactivated. Ozone kills bacteria by rupturing the cell wall (similar to popping a balloon) and by destroying the outer shell of viruses. Unlike most chemical disinfectants, microorganisms cannot develop a resistance to ozone.

Why is a chlorine residual required?

Because ozone is a gas and very reactive, it is impractical to establish an ozone residual. Therefore, a chlorine residual is required to protect swimmers.

Is ozone an algicide?

Ozone controls algae indirectly by removing bather load and making chlorine more efficient.

Does ozone affect pH?

Ozone is pH neutral and does not affect or act differently over the normal range of pH values found in pools

Does ozone work with bromine?

Yes. However, equipment size must be increased to accommodate bromine-ozone interactions.

Does ozone work with ionizers?

Yes. Ozone reacts with copper and silver very slowly.

My pool has turned cloudy since starting the ozone system, What should I do?

Cloudiness is a sign that ozone is doing its job. Continue to run the filter and it should disappear in a few days.

Clouding could also indicate a filter problem. Check filter for damage and proper operation. Backwash if necessary.

How much will chlorine usage be reduced?

Results depend on a variety of factors, but a typical residential pool will use 60-80 percent less chlorine. Chlorine usage on commercial pools will typically be reduced by 40-60 percent.


How often do I have to shock?

The amount of time between shocking will typically be 2-4 weeks, although this figure may vary.


What constitutes a shock?

A true shock, or breakpoint chlorination, occurs when ten times the combined chlorine levels is added to the water. Consult the chlorine manufacturer’s recommendations to determine the precise quantities required.


Can I use non-chlorine shocks?

Yes, but they are not recommended since they do not have the same effect as a chlorine shock



How is ozone generated?

Ozone is generated by passing air over a specially designed UV lamp. As the air passes over the lamp, some of the oxygen is converted to ozone.

I've heard ozone works on spas, will it work on pools?

Ozone will work on pools. Spas are actually more difficult to treat because there is less water per bather and they are operated at higher temperatures.

Prozone systems have been in use since 1977 and models are available for any size pool.

Can I install Prozone equipment outdoors?

All Prozone equipment is rated for outdoor use.

How long will it take to install a Prozone Unit?

It will typically take 30-60 minutes to plumb the unit. An electrician may be required by law to perform the electrical hook-up. Installation is very easy with Prozone’s step by step instructions.

What are the different types of ozone equipment offered by Prozone?

Prozone builds two types of UV ozone generators for pools: venturi driven (PZ4 and PZ7) and compressor types (PZ2 Series). The PZ4 is for aboveground pools, the PZ7 Series for inground pools up to 40,000 gallons, and the PZ2 Series for large residential, commercial pools and commercial spas. The PZ2 Series is UL NSF rated.

Venturi Driven:

The PZ7 Series, PZ4, and spa units operate by running water through a device called a venturi. When water flows through the venturi, it creates suction, drawing air past the ozone producing lamps.

Installation: Bypass over the filter. The inlet leg to the venturi is plumbed between the pump and filter and the outlet leg is plumbed into the return after the filter and heater if installed (ozone can erode copper tubing).

Installation Concerns: Venturis will not operate properly if the pressure on the outlet exceeds 5 psig. Pools with in floor cleaners, equipment below water line, or with eyeball valves may require compressor systems.

Compressor Driven:

The PZ2 Series uses diaphragm compressors to force air over the ozone producing lamps. Venturis are still used with the compressor to reduce the load on the units.

Installation: Compressor systems may be installed with a bypass as described in the venturi section or by plumbing directly into the return after the filter and heater if installed.

Special Installation Considerations: Equipment installed below the water line or more than 8 to 10 feet above it should use a solenoid valve instead of a check valve.

How long should I run the ozonator?

Ozone generators run with the pool circulation system. The longer the system is run, the greater the benefits the user will derive from the ozone generator. Typically, 6-8 hours per day is sufficient although this can be reduced to 4 hours during low usage. The system should be run for 24 hours after a heavy usage such as a party.

How can I tell the unit is operating correctly?

Venturi Systems:

Ozonator: The PZ7 Series has a clear gasket at each end of the unit. It will emit a blue glow when the system is operating properly.

The PZ4 has a gasket at the top of the unit and an air gap on the bottom. Both will emit a blue glow when the unit is operating.

The PZ3-X has translucent end caps which will emit a bluish green glow when the unit is operating.

Venturi: The water appears opaque white from the thousands of entrained bubbles.

Compressor Systems (PZ2 Series):

Ozonator: The barbs at the end of the case are translucent and will glow blue when the unit is operating. Look at the base of the barb (hexagonal) where the tubing is clamped on the long white cases.

Compressor: Listen for motor noise. Unit can run even if diaphragm fails, so a change in the sound of the system may indicate a problem.

Venturi: The water appears opaque white from the thousands of entrained bubbles. In some cases, larger bubbles may appear with compressor systems.

I smell ozone, is it safe?

The quantity of ozone produced will never reach levels which are harmful at the return or in the pool room under normal operation.

Additional information can be found in our individual product manuals which can be downloaded here.

Or contact us with your questions here.

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