Swimming Pool Ozone Generators: FAQs

SP Series Spa & Pool Water Applications

Swimming pool ozone generators can reduce chemical reliance by up to 95%, but the thought of switching how you maintain your pool system could seem daunting. Check out this list of commonly asked questions about our pool ozone units.

Q: What are the benefits of using ozone?

  • Bacteria kill rate is up to three thousand times faster
  • 50% stronger oxidizer than chlorine
  • Reduces traditional chemical usage between 60% to 95%
  • Reduce handling and storage of unsafe chemicals
  • Reduce constant purchasing of harmful chemicals
  • Eliminate costly replacement of faded swimwear
  • Remove unpleasant chlorine odors
  • Improvement of the filter and coagulant capacities = reduction of coagulant use and less water backwashing
  • Water consumption can be decreased, because of an increase in water quality

Q: Can I stop using Bromine?

A: You will definitely reduce your chemical usage in your pool up to 95% depending on weather conditions and pool characteristics. Ozone provides better water quality and oxidizes many contaminants that bromine cannot. However, ozone only lasts in pool water for a short period of time (15-30 minutes) therefore in order to provide lasting protection during times when ozone is not being injected, to control algae and to oxidize ammonia and swimmer waste, you must maintain a small residual of bromine (1.0 to 2.0 PPM of bromine) in the water.

The longer the ozone system operates the less bromine you will have to use to maintain water quality. Ozone will kill algae at the point of injection, not algae that are growing on the pool walls. Recommended dosage for Sodium Bromide is 20g per 1000 liters of water every 6 months.

Q: How does ozone get into the water?

A: Ozone is a gas and it is only slightly soluble in water. It must be thoroughly dissolved in water so that the chemical reactions with contaminants can take place. The most common way in swimming pools is with a venturi injector, which is a device a 100mm in length with each end the same diameter (40/50mm) as the pool plumbing line. A section of pool piping 20 is removed, and a venturi injector is installed. The injector’s diameter is smaller in the middle, similar to squeezing or pinching a hose.

The water traveling into the injector begins to move faster. In the middle of the injector there is a small hole. As water is pumped through the plumbing and past the hole, a vacuum is created. The amount of vacuum is dependent on the amount of water flow through the injector – more water equals more vacuum. If a small flexible hose or tube is attached to this small hole, a liquid or gas can be drawn into the injector and mixed into the water. The goal is to make the smallest bubbles possible and to keep the bubbles in contact with the water for as long as possible. The ozone that does not get dissolved will kill or oxidize anything in the water.

Q: How long will ozone last in my pool?

A: For the purification of water and air, it’s needed to produce ozone on-site. Because of its short half-life, ozone will decay soon when produced. The half-life of ozone in water is about 30 minutes, which means that every half hour the ozone concentration will be reduced to half its initial concentration. For example, when you have 8g/l, the concentration reduces every 30 minutes as follows: 8; 4; 2; 1; etc. In practice, the half-life is shorter because a lot of factors can influence the half-life.

Factors are temperature, pH, concentration and sort solutes. Because ozone reacts with all kinds of components, the concentration of ozone will reduce quickly. When most of the components are oxidized, the residual ozone will remain, and the concentration of ozone will reduce.

Q: Will the temperature or humidity of the air/water affect ozone?

A: The temperature and humidity of the air will directly impact on the concentration of ozone gas produced. The more humid and hotter the air, the less concentrated the ozone produced will be. Likewise the temperature of the water has a similar effect; the cooler the water the ozone is injected into, the more effective the ozone will be at removing contaminants. Heated pools require 10-15% more ozone than traditional pools.

Q: Is ozone safe for my pool equipment?

A: Most pool systems these days come supplied with the plumbing that is ozone-resistant, example PVC piping. However, ozone gas can corrode metal and other materials such as nylon and rubber. Care must be taken to check that all plumbing and piping between the injection point (Venturi Injector) and the point of entry to the pool are made of ozone resistant materials. All our ozone generators are supplied with ozone-resistant accessories.

Q: Is ozone safe for swimmers?

A: Ozone is dissolved in the water in pH neutral so the pH will not harm equipment or people. When properly installed and plumbed all of the ozone generated will be dissolved in the water or used up oxidizing impurities in your water.

Q: Does ozone affect water balance?

A: Ozone has a neutral pH (about 7.0) so it does not affect pH. Ozone has no calcium, no alkalinity, and no dissolved solids. Therefore, ozone does not affect water balance. It does remove trace amounts of metals such as iron or copper by oxidizing them to their highest oxidation state. They will then precipitate out of the water and be trapped by your filter.

Q: Can I run my pump and filter for fewer hours?

A: Ozone is only injected into your water when the pump is running. The longer you run the ozone generator (And your pump and filter), the best your resultant water quality will be and thereby reducing the need for residual chemicals.

During summer/swimming season you should run your ozone generator, pump and filter a minimum of 12 hours each day. We recommend that you run your pump for 24 hours a day in the summer. Up to 80% of the water treatment is done by your filter, so don’t be afraid to use it. The extra electricity cost will be compensated by the savings on costly chemicals.

Q: Will there be a visible change to my water?

A: Yes, when ozone is first introduced into your pool water and during the first 72 hours, your pool water may get cloudy. Ozone will begin to oxidize all of those particles and metals that your present sanitizer would otherwise leave in your pool. When these particles are oxidized, they form visible particles that are heavier than water and precipitate. Also, there will be pieces or fragments of the cells that ozone has destroyed. So the cloudiness that you may see is oxidized materials, pieces and fragments of cells, and metal precipitates. Some of the dirt and debris in the water is too small to be trapped by the filter.

These small sized dirt particles have a weak electrical charge or pole. Because all the dirt particles have a negative charge, they repel each other like two magnets. They are so small that they are not affected by gravity and therefore won’t settle out either. Ozone neutralizes these charges, which allows the particles to combine into large enough particles to be trapped by the filter. Once these particles are oxidized, neutralized and filtered, the water will have 22 a definite “clarity and sparkle” that you may not have experienced before. In addition, after the ozone does its work, it reverts back to oxygen. This added oxygen will make the water look, feel and even taste better.

Q: How should I prepare my pool or installation of the ozonator?

  • Backwash pool
  • Adjust alkalinity with hydrochloric acid or sodium bicarbonate 80-100ppm
  • Adjust pH 7.2 to 7.8 (HCL acid to lower and sodium bicarbonate to increase)
  • Shock treat with hydrogen peroxide 35% (100mL/1000 Liters pool water)
  • Ozone is used as primary sanitizer and sodium bromide as secondary or residual sanitizer
  • Sodium bromide should test between 1-2 ppm (dosage: 20g per 1000 liters of water every 6 months)

Q: What special maintenance will the swimming pool require?

  • Shock treat with hydrogen peroxide
  • Maintain total alkalinity with hydrochloric acid or sodium bicarbonate 80-100ppm
  • Maintain pH 7.2 to 7.8 (HCL acid to lower and sodium bicarbonate to increase)
  • Shock treat with hydrogen peroxide 35% (100mL/1000 Liters pool water)
  • Keep pool clear of leaves and debris
  • Check and clean basket daily. Backwash regularly.
  • Use Algaecide if required—consult supplier for ozone compatible type What special maintenance does the SP unit require?
  • Check non-return valve for signs of water returning into the tube to the ozone generator – replace if necessary.
  • Check the silicone tube for deterioration – replace if necessary.
  • Check the unit for internal air filter for blockage.
  • Check that small, fine bubbles are coming from pool return jet.
  • Make sure no debris or dirt is blocking fan guards.
  • Use the fingertip test on the air inlet port to the ozone generator to check that suction is still present and venturi injector is working correctly.

Q: How do I know if there is enough ozone for proper sanitation?

A: This can be a difficult question to answer. Experts have not been able to develop minimum 23 or maximum level for ozone in swimming pool water because of the multiple variables involved such as air temperature, water temperature, humidity and bather load. Pool owners who have been using chlorine of bromine for a few season know how much sanitizer they use in a season or year. Installing an ozone generator in these pools has resulted in a significant reduction in the amount of chemical sanitizer used.

The longer the ozone operates each day, the greater the reduction in chemical sanitizers. Pool owners have had reductions in sanitizer use of 50-90%. Your savings may vary based on pool usage factors. Ozone is not sold on the basis of being less expensive than other sanitizers such as chlorine and bromine are. Its value is in smoothness and sparkles to the pool water, elimination of the dry, itchy skin that chemicals can produce burning red eyes and bleached bathing suits. Other important advantages include reduced pool maintenance and reduced exposure to toxic chemicals in storing, handling and swimming.

Q: Will my ozone generator help the ozone layer?

A: Ozone from a swimming pool ozone system will not add anything to the atmosphere or the ozone layer. When injected into the water properly, no ozone escapes into the atmosphere. Even if it does get into our atmosphere, it is like a drop in the ocean. Also, the ozone would have to be transported 9 to 18 miles up. The ozone results almost entirely from oxygen (O2) splitting apart into two atoms of oxygen (O2) by solar ultraviolet radiation (the sun’s UV rays) and then combining with molecular oxygen (O2) to form ozone (O3).

Atmospheric ozone plays a critical role for the Earth by absorbing the ultraviolet radiation from the sun with a wavelength of between 240 and 320 nanometers (nm), which would otherwise be transmitted to the Earth’s surface. This radiation is responsible for sunburn to human skin. In addition, the incidence of skin cancer has been statistically correlated with UV light intensities of 290 to 320 nm.




In case of accidental leakage of ozone, keep the ozone generator in a 
well- ventilated area. 
Ozone generators emit ozone. Do not inhale ozone. 
Ozone generators generate high voltage. 
Our ozone generators are designed and distributed by A2Z Ozone, Inc. in Louisville, Kentucky USA. EPA Est.: 95432-KY-1. Produced and made in China.

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