Hot Tub Ozonators

Howdy from the never snowed in, mostly always hot, Hot Tub Outpost, folks. Whenever we have free time here at the Outpost, there is nothing we enjoy more than learning about Chemistry and hot tubs. Lately, we have received a few questions from some of you kind folks about what exactly is an “Ozonator?” To best answer this question, Sherriff Tek had to find his old chemistry textbooks from, well, a long time ago out in one of the side barns. What is Ozone? See ‘fer yourself:


a bluish gas or blue liquid, being an allotropic form of oxygen, O3; it is antiseptic and disinfectant. Ozone that is carried in the air (or water) is odorless and colorless.

How an ozonator works to keep your spa water clean: The ozone generator in your spa generates APG ozone cells. A UV-C light is introduced to the ozonated water and reacts with the ozone. This creates powerful hydroxyl radicals that effectively sanitize the water in your spa. Ozone is a natural disinfectant. The powerful oxidizing form of oxygen neutralizes and destroys organic and inorganic contaminants in your hot tub water. The only by-product is oxygen, so there are no chemical residues.

Here’s a pretty picture of it:An ozonator generates and injects ozone – a natural form of oxygen with an extra oxygen atom (O3) into your spa water system. Ozone itself kills potentially harmful critters like bacteria and other contaminants in your spa water. Ozone likes to connect to other things floating around in your water system such as sunscreens, soap, lotions, cosmetics and even human secretions like sweat, saliva and such. Ozone generators can destroy up to 99.9% of harmful contaminants including Cryptosporidium parvum, Giardia and other microorganisms. All this ozone activity helps your filtration system perform better. Dang!

Ozonators save you time and money on water maintenance. Ozone generators help keep the water clean and in balance with fewer chemicals. Not only is this healthier for you, but clean and balanced water is easier on your spa components. An ozonator can help reduce the need for replacing or repairing other components like pillows, heaters, pumps and jets. Replacing your ozonator when it no longer works could save you a lot of money in repairs and extend the life of your hot tub. Most people find there is less water odor and their skin, hair, nails and eyes are less irritated when an ozonator is used.

For more information on ozonators/ozone generator, click this link:

Ozonators have increased in popularity over the past few decades. Almost all spas manufactured now come ozone-ready. The ozonator injects ozone into the water through your plumbing as the water circulates. When the pump is running, it creates a water flow that passes through the ozone injector – injecting ozone into the circulating water to maximize sanitation and minimize off-gassing. The ozone is delivered through the PVC tubing and begins to sanitize on contact. A check valve helps prevent water from backing into the ozonator. Generally, the ozonator should run at least 6 hours a day, but let it run more often if you use your hot tub a lot.

There are two types of Ozonators: The first, which is a slightly older technology – is known as an Ultraviolet ozonator, which works perfectly fine. The other is a slightly newer technology called a Corona Discharge ozonator – which generates a sheet of plasma to generate ozone in your spa. I will leave it to all you friendly spa folks out there to further investigate exactly what a sheet of plasma is, but either one of them works fine. The ozone generator added to your system probably has more to do with when your spa was manufactured than anything else. If your ozone generator is not working just right, the best idea is to replace the exact one you have installed or its newer generation kin as this will ensure easy replacement and installation. Just put the new one where the old one was, and never forget to shut off spa electricity before fooling around with electronics. If you are looking to replace your old ozonator, look for a label with the manufacturer name and model number, then plug that into our search box or call us to order. If your ozonator is an older, discontinued model, we can suggest a replacement. And if you happen to find yourself needing an ozonator, we have plenty of’em, all types and parts:

How do you know if your ozonator is working right? Generally, you will notice that it is difficult to keep your water chemistry balanced. Ozone helps keep your pH in check since it is a natural pH balancer. You can also check with ozone test strips: Another clue is age – an ozonator generally lasts no longer than 3 years.

Until next time, remember: “No hour of life is wasted that is spent in the saddle.” – Sir Winston Churchill