Cleaning with Liquid Ozone: What you need to know

We connect with a lot of parents and clients who are doing great work eliminating toxic chemicals from their homes.  They want to do even more, but they don’t know how – and that’s why they’re working with us.  We advocate and implement ozone technology as a Toxic-Free Cleaning option.
The cornerstone of this system is using liquid (or aqueous) ozone to replace chemical disinfectants.  Disinfectants are #1 on our list of 10 Most Toxic, so that’s a great place to start!  Aqueous, or liquid ozone is perhaps the most misunderstood and maligned technology that we utilize, largely because of misunderstandings about ozone in general.  Therefore, it has become the subject of undue concern.


To set the record straight, we’ve compiled a list of FAQs that we’ve received and answered for clients.

1.  How safe is liquid ozone?
Liquid ozone is in fact a strong oxidizer.  However, this does not mean that it is corrosive or combustible in the aqueous form (i.e. a solution of water).  In residential and commercial cleaning applications it is completely safe and won’t harm bare skin.  In fact, it may help to kill germs that your hands may have contacted during the cleaning process.  Therefore, you don’t need to wear personal protective equipment like gloves as you would with harsh, chemical-based cleaning solutions.

The concern with liquid ozone tends to be around it off-gassing and becoming gaseous which dissolved at proper levels and sprayed at safe pressures won’t do (see #5 below).  That being said, nobody has ever died of liquid ozone exposure, whereas every day someone dies from household chemical exposure.  In fact, cleaning staff with asthma using our product say their breathing is perfect after working with it for 8 hours, contrary to the effect chemicals had on their breathing by the end of a shift.


2.  Is liquid ozone bad for asthma suffers?

No.  There is much confusion between liquid ozone and atmospheric ozone.  However, high-atmospheric (gaseous) ozone concentrations are bad for asthma and allergy suffers.  It can contribute to those Code Red days which the weatherman warns us about.  Atmospheric ozone is created by Mother Nature to try to break down air pollutants like NOX, VOCs, dust and allergens.  So on those Code Red days, more ozone is being produced naturally because there are more VOCs in the air.  Ozone gas is an indicator that there are other atmospheric contaminants that also affect asthma and allergy sufferers like VOCs, nitrogen oxides, dust and pollen.  Being quicker and easier to measure than the thousands of air pollutants, ozone gets a bad rap.

ozone production from smog

Man-made atmospheric ozone an also be produced by air purifying generators and filters to deodorize and disinfect rooms like operating rooms, hotel rooms, and even weather-damaged homes.  Allergy and asthma sufferers should indeed be wary of such high concentration applications.

Liquid ozone cleaners,  are different than atmospheric ozone generators. They create ozone gas infused into a watermedia, as opposed to the air.  Since ozone is an unstable molecule, it reverts to oxygen faster than the water evaporates without off-gassing.  In this way liquid ozone is a safe and preferential alternative to chemical disinfectants, many of which are themselves asthma triggers.
3.  How does liquid ozone work?
Ozone is a molecule of three oxygen atoms (O3) that is not stable and will breakdown quickly and form radicals that have a high oxidation potential, or redox.  This is what makes it a strong oxidizer and disinfectant.  During the oxidation, only one oxygen atom is used for the chemical reaction forming with hydrogen into OH-radicals.  Harmless to people, the ozone quickly attacks and eliminates contaminants it comes in which it contacts.  The oxidization reacts with the cell walls of bacteria and viruses the same way hydrogen peroxide and iodine do, causing cell poration of the microbe, which leads to its death.  The oxidation also removes electrons of molecules, eventually rendering them inert.  In this way O3 kills the bacteria that cause odors, viruses that cause illness, as well as breaks down bio matter on surfaces that provide the food for microbes.

4.  How much ozone do liquid ozone cleaning solutions contain?

It varies from application and manufacturer.  It can be is as high as 5ppm or more for high-volume industrial settings but is normally around 2-3 ppm for most cleaning and sanitation applications.  We keep ozone levels in water to reasonable levels to prevent off-gassing as ozone in air is regulated by OSHA.  
5.  How long does ozone last?
Ozone in aqueous form has a roughly 15 minute half-life (dependent upon temperature and water quality).  While is is obviously NOT radioactive as “half-life” may seem to imply, it is used because of ozone’s rapid degradation.  In 15 minutes half its solution has lost potency, at which point it is a better cleaning solution than disinfectant for the next few hours.
6.  What residues will liquid ozone leave after it dries?
Contrary to chlorine, which always leaves an oxidation or disinfection byproduct, ozone simply will revert back to oxygen.
7.  How strong is liquid ozone?
Ois is often compared to bleach and other chlorinated products as they are used in many of the same disinfection applications.  When used as such ozone has proven to be 50% stronger and 3000x faster than bleach.

In regulated cleaning applications, EPA guidelines direct us toward disinfection with chlorine and ozone.  For example, disinfecting with 1 ppm chlorine at a water temperature of 59°F and a pH of 7 requires a dwell time of 75 minutes. The disinfection efficiency achieved will be 99.9 percent.  Assuming the same temperature and pH, a concentration of 1 mg/l of liquid ozone water achieves a disinfection efficiency of 99.9% in only 57 seconds.  For this example giardia is the parasite used in the water sample because it is one of the most difficult microorganisms to kill.

8.  How is liquid ozone produced?

Ozone in water can be produced with an electrolytic ozone generating cell, or via corona discharge and dissolved into water via an ozone injection system.  Smaller systems or systems with ulltra-pure water can use an electrolytic cell.  All larger and industrial systems will use a corona discharge ozone generator and injection system.

9.  What other applications does ozone have?

Ozone has many applications on the home and commercially.  We covered cleaning using liquid ozone quite thoroughly by now.  Ozone generators can be made for water treatment plants and are in use all over the world.  There are applications for it in laundry and dish washing, but mostly in commercial or industrial settings.

Ozone generators have been used on both public and private pools as a means of disinfecting pool water.  Similarly, some aquariums use it to keep water fresh and germ-free.  Another important application is air purification.  As an oxidizer it attacks the bacteria at the cell level, killing them and their aerobic activity, which is what causes odors and areas of potential for infection.

SB-100 Ozone Spray Bottle

SB100 Ozone Spray Bottle
SB100 Ozone Spray bottle

The SB100 Ozone Spray bottle uses an electrolytic ozone generating cell to produce ozone in water as the bottle is used. No chance of low ozone levels as ozone is produced real-time while used. Great for small scale cleaning applications

Ozone Injection Systems

OST-40 ozone water system with optional dissolved ozone monitor and ORP monitor.
Ozone Injection System
Mobile ozone water system
Mobile ozone water system


For larger scale applications an ozone water system can be used. Ozone levels in water of 3-5 ppm can be created easily at water flow-rates from 3 – 300 GPM.

Should you have questions about cleaning and disinfecting with liquid ozone, please call our office.

Aeroqual wins Hi-Tech Award 2016

We are very proud to announce that air quality technology from Aeroqual has won a major prize at the 2016 NZ Hi-Tech Awards. Our AQM 65 compact air quality monitoring station took the top award in the Most Innovative Hi-Tech Hardware Solution category.


Most noticeably, the AQM 65 packs a complete air monitoring station into a box the size of a large suitcase. And though at first glance it may be ‘just a box’, its outside-the-box components stand out from those of traditional air quality technology.

Rather than using conventional analyzers, our specialty is taking low cost sensors and turning them into instruments that can produce high quality measurements in the toughest of environments. Most off the shelf sensors are not suited to the challenge of ambient air quality monitoring, so Aeroqual has assessed hundreds of sensors against demanding criteria. We also make our own sensors for some gases, like ozone and nitrogen dioxide, because no better ones exist for our applications.

However, sensors can be prone to cross interference – for example, nitrogen dioxide sensors are sensitive to ozone which is likewise found in urban environments. We use scrubbers to physically remove interfering gases, and also run a ‘zero cycle’: alternately sampling with and without the interfering gases removed. The difference between the measurements gives the target gas concentration.

Because sensors are susceptible to changes in temperature, the AQM enclosure is insulated and temperature-controlled. A mix of heaters and compressors work to maintain a target internal temperature of 22 deg C, plus or minus 0.2 deg C. The walls contain a series of ducts and fans that prevent a temperature gradient developing inside.

The AQM 65 can be permanently installed or used for mobile monitoring over a wide area, say in a city or around an industrial plant. Either way, it’s more than a piece of equipment. To support the hardware, we’ve developed cloud-based software that remotely and wirelessly collects and analyses the data, and makes sense of it for our customers. As well, this information allows us to quickly diagnose any faults and direct our local service agents to provide expert support, including ongoing maintenance and calibration.


To come up with a solution implies there is a need or problem. In this case, it’s that outdoor air quality is deteriorating for a majority of the world’s people, and recent research from the World Health Organisation shows this is impacting their health more adversely than has previously been thought. But good decisions about air quality rely on good relevant data – and that has often been inaccessible because accurate measurement equipment has been bulky, hard to operate, and formidably expensive.

We’ve reduced the size of the AQM, the complexity of the instruments used to measure air quality, and ultimately reduced the cost. This makes reliable air quality technology attainable for a growing market of worldwide customers: government and local government agencies, industrial companies, environmental consultants, and research organisations.


The NZ Hi-Tech Awards received a record number of entries this year, and several of the judges commented that the standard of entries is the highest yet seen in the event’s 22-year history. We are very proud to announce this recognition for our technology innovation.

Researching ozone for use in New Zealand dairy industry


Grant could save dairy industry millions

Garth Lovatt has received a grant to research the use of ozone on New Zealand dairy farms

An Auckland man has received a grant that he believes could save the New Zealand dairy industry millions of dollars.

Former engineer Garth Lovatt will travel to Europe, North America, and Asia in April to research the idea of using ozone in a sustainable and profitable dairy model.

Ozone is made up of air and electricity, and could provide a range of benefits to dairy farmers, without negative impact.

The trip will allow Mr Lovatt to research ozone-related technologies for different uses, including as an oxidiser and antimicrobial on dairy farms which would replace antibiotics and pharmaceuticals for the treatment of cattle.

Mr Lovatt said his research could help boost the New Zealand dairy industry by $1 to 1.5 billion dollars annually, with ozone having many benefits in dairy farming.

One of these benefits, he said, was that ozone would prevent losses of dairy cows on farms due to infection.

“If we can correct that [the losses], which I think we can do by using ozone, I have got to go and talk to the manufacturers and researchers that are leading the charge.”

Mr Lovatt will meet individuals and organisations that are already using ozone as an oxidiser and antimicrobial to gain further knowledge on the topic.

The Agricultural and Marketing Research and Development Trust (AGMARDT) awarded the grant to Mr Lovatt, with AGMARDT general manager, Malcolm Nitschke, saying the project was original and revolutionary.

“AGMARDT seek innovative ideas, and we felt this project was considered very innovative, it hadn’t been done before. If it comes off, it could be truly transformational for the industry.”

Ozone, like antibiotics, kills bacteria but does not cause mutations or generate resistant types within the cows – unlike antibiotics.

Because of this and other factors, Mr Lovatt said the use of ozone on dairy farms would allow for sustainability as well as profitability.

The grant given to Mr Lovatt is gaining support for his research from DairyNZ, a company producing research and development for sustainable dairy farming in New Zealand.

DairyNZ’s industry education facilitator, Susan Stokes, said AGMARDT funding added value to the dairy industry by building leadership capability and sponsoring and enabling innovative research.

“This then attracts and retains talented people that will develop creative solutions for the New Zealand dairy industry.”


Learn more about the use of ozone on the dairy farm at our website below:

New study shows iron in dairy drinking water affects milk

Iron in cows drinking water can negatively affect milk quality.

A new study published in the Journal of Dairy Science has proven a link to poor milk quality due to elevated iron levels in drinking water on dairies.  This new information gives more credence to the use of ozone for drinking water treatment on dairy farms.

A study at Virginia Tech's Department of Food Science and Technology looked at the effect of iron contamination of cows' drinking water. Photo: iStock - Andriy_Yelizarov

While we have used ozone for iron removal in drinking water for dairies, along with many other water treatment applications, we did this for improved milk production, and higher water/feed intake reasons.  This new study shows that even the milk produced from cows drinking water with elevated iron is of a lower quality due to iron in the drinking water.

Follow link below to see full paper:

Milk protein composition and stability changes affected by iron in water sources


Water makes up more than 80% of the total weight of milk. However, the influence of water chemistry on the milk proteome has not been extensively studied. The objective was to evaluate interaction of water-sourced iron (low, medium, and high levels) on milk proteome and implications on milk oxidative state and mineral content. Protein composition, oxidative stability, and mineral composition of milk were investigated under conditions of iron ingestion through bovine drinking water (infused) as well as direct iron addition to commercial milk in 2 studies. Four ruminally cannulated cows each received aqueous infusions (based on water consumption of 100 L) of 0, 2, 5, and 12.5 mg/L Fe2+ as ferrous lactate, resulting in doses of 0, 200, 500 or 1,250 mg of Fe/d, in a 4 × 4 Latin square design for a 14-d period. For comparison, ferrous sulfate solution was directly added into commercial retail milk at the same concentrations: control (0 mg of Fe/L), low (2 mg of Fe/L), medium (5 mg of Fe/L), and high (12.5 mg of Fe/L). Two-dimensional electrophoresis coupled with matrix-assisted laser desorption/ionization–tandem time-of-flight (MALDI-TOF/TOF) high-resolution tandem mass spectrometry analysis was applied to characterize milk protein composition. Oxidative stability of milk was evaluated by the thiobarbituric acid reactive substances (TBARS) assay for malondialdehyde, and mineral content was measured by inductively coupled plasma mass spectrometry. For milk from both abomasal infusion of ferrous lactate and direct addition of ferrous sulfate, an iron concentration as low as 2 mg of Fe/L was able to cause oxidative stress in dairy cattle and infused milk, respectively. Abomasal infusion affected both caseins and whey proteins in the milk, whereas direct addition mainly influenced caseins. Although abomasal iron infusion did not significantly affect oxidation state and mineral balance (except iron), it induced oxidized off-flavor and partial degradation of whey proteins. Direct iron addition to milk led to lipid oxidation during storage at 4°C. Oxidation level was positively associated with the concentration of added iron. Minerals (Mg, P, Na, K, Ca, Zn) in milk were not affected by the added iron in milk. This study indicated that a small amount of iron contamination in bovine drinking water at the farm or incidental iron addition from potable water sources causes oxidation, affects milk protein composition and stability, and affects final milk quality.

The Ozone Answer:

Ozone used with filtration can not only efficiently remove iron from drinking water, but also remove manganese, H2S, turbidity, and other taste/odor issues from water.

Ozone Injection and filtration system
Ozone iron removal system

By using ozone for drinking water, better water disinfection can be realized without added by-products to the water.  Also, increased dissolved oxygen levels will be present in water as ozone will break down into natural oxygen.  Greater milk production has been realized from the use of ozone in dairy drinking water.

For help with your dairy, or any drinking water application give our engineers a call today.  We would be glad to help.

Ozone sensor calibration kit for rent

Calibrating ozone sensors is unlike calibration of many other common gas sensors.  Ozone cannot be stored and must be produced on site.  This eliminates the possibility of buying calibration gas for your ozone sensor.

We now offer a solution to this common challenge.  We offer the ATI A23-14 Ozone Calibration kit as a rental by the week or month.

Calibrate ozone sensors
A21-14 Ozone sensor calibration kit

Rental Terms:

  • Pre-payment required for all rentals – payment can be made via credit card online
  • Rental period is for term paid for, shipping time to and from customers location is not included in rental term and is not billed
  • Shipping both to and from the customer is paid by the customer – Ground shipping is okay
  • Equipment gauranteed to arrive in working order, any damge to equipment will be billed to customer
  • Rental term can be extended at any time during the rental
  • Discounts for longer term rentals apply, arrangements must be made up front

Compatible ozone sensors:

  • C16 PortaSense
  • F12 Ozone Transmitter
  • D12 Ozone Transmitter
  • A14/A11 Ozone Detector
  • Series-200 with EOZ sensor head
  • Series-300 with EOZ sensor head
  • Series-500 with EOZ sensor head

We can provide the calibration kit or adapter necessary for each of the sensors listed above.  Be sure to ask us for these parts if you do not have them yourselves, we will ship with the A23-14.

Don’t see your sensor on the list?  Call or e-mail us, we will do our best to accomodate your needs.

The A23-14 ships in a handy carry case with all the equipment you need for ozone sensor calibrations.  A calibrated amount of ozone is produced and flows to your sensor for calibration purposes.  We check the ozone output of the A23 each time we ship this device to ensure the best ozone accuracy for your application.

calibration ozone sensors on-site
A23-14 Ozone Calibration Kit carry case

Ice-O-Matic introduces an ozone generation system

Ice-O-Matic, an ice machine manufacturer recently introduced their own ozone generation system to be used exclusively with their brand of ice machines for sanitation and safer ice.

Global ice machine and dispenser manufacturer, Ice-O-Matic, today announces the launch of their new Ozone Delivery System: the O3-Matic. This new groundbreaking device infuses ozone into incoming water, killing microbes on every surface it touches and retarding future growth. In addition, the ozone becomes entrapped in the ice cubes, carrying the same sanitation benefits to the bin and dispenser. Introducing ozone increases intervals between sanitizing, impedes microbial growth while continually sanitizing your ice making system, and diminishes mold, mildew, bacteria and viruses. Ozone also improves the taste and eliminates odor in iced drinks. The Ice-O-Matic’s O3-Matic is designed for modular cube ice makers and can be retrofitted to all existing units. – See more at:
 ozonated ice produced commercially in standard ice machines
Recently we posted about the Eco3Ice Technology from Franke Foods.
Implementing a small ozone generation system on a commercial ice machine allows the production of ozonated ice.  Producing ice from water that contains ozone allows the benefits of ozone to be trapped into an ice cube and essentially stored.  If you are looking for a way to “store” ozone this is a viable method.  As the ice melts the ozone is released and retains the antimicrobial properties.  This lowers the cleaning intervals of the ice machine and provides a potentially safe cube of ice as harmful mold and bacteria that may have been present in the ice machine are not destroyed.
The use of ozone in commercial ice machines is becoming more popular as ozone technology becomes easier to implement, and awareness of the benefits of ozone expand.

Ozone gas sterilizes medical equipment

Ozone Gas Treatment Used To Sterilize Medical Implants Can Save Money, Time

Sterilizing medical implants may be easier, more convenient, cheaper, and faster now that researchers have found a superior option: ozone gas.

Every year, millions of people in the United States go through inpatient surgery. In 2010 alone, 51.4 million surgical procedures were performed in the United States, of which 332,000 were hip replacements, 719,000 were knee replacements and 454,000 involved the insertion of a stent to the heart, according to the Centers for Disease Control and Prevention.

Many of these procedures will require implants such as pins and screws, which may now be made of polymer. The same material may also be utilized for tissue engineering, regeneration medicine and the delivery of drugs.

Indeed, polymer medical devices have gained popularity over the years because of their biocompatibility, more clearances from Food and Drug Administration and lower costs than other materials like ceramic or titanium.

But even then, polymer implants can be problematic for hospitals for many reasons.

“Maintaining sterile manufacturing facilities is extremely costly, so the ideal scenario is to sterilize the matrix post-manufacture,” said Paul De Bank, pharmaceutics lecturer at the University of Bath in England.

However, the existing sterilization methods, which include radiation by electron beams, are challenging since they can potentially change the physical and chemical properties of the material. They also need additional training for the staff due to the complexity of the procedure, making these processes time-consuming and inconvenient.

The researchers from the University of Bath, in partnership with the University of São Paulo and the National Council of Technological and Scientific Development of Brazil, are currently recommending a more viable option: ozone gas.

Using ozone gas, produced by splitting oxygen to monoatomic molecules, for sterilization is not new. However, it had only been used to disinfect water and medical devices made of metal.

For the experiment, the team worked with nanofiber scaffolding made of specific polymer called poly(lactic-co-glycolic) acid (PLGA) and with Geobacillus stearothermophilus, a common biological indicator, to validate the sterilization process.

When the heat-resistant bacteria were exposed to pulsed ozone gas, they died. But the process didn’t change any of the components of the scaffolding, and cells continued to grow as should happen.

Moreover, since the gas is just a by-product of oxygen in the atmosphere, it is cheaper to acquire and maintain. It is also convenient since it can be used to eliminate other types of pathogens like fungi and viruses.

The researchers believe that ozone gas can become a standard for sterilizing polymer implants. Not only that, “the fact that ozone performed so well suggests it could be routinely used to sterilize not only PLGA, but a wide range of materials used in clinical implants,” expressed De Bank.

– See more at: