Ozone Generators For Indoor Cannabis

Thinking about using an ozone generator? Read all you need to know!
19 August 2021
5 min read
Ozone Generators For Indoor Cannabis

  • 1. What’s ozone?
  • 2. Ozone generators in cannabis
  • 3. Pros and cons of using ozone generators
  • 4. Top safety tips when using ozone generators
  • 5. Alternatives to ozone generators
  • 6. In conclusion

Depending on the number of plants in your grow room, cleaning with a bleach mixture might be too laborious and a filter carbon may not eliminate the cannabis smell completely. In these cases, home growers use ozone generators to get the work done. Ozone generators are machines that can inhibit mold growth, prevent pathogens, sterilize your grow room, and help you eliminate the cannabis smell effectively. 

1. What’s Ozone?

Ozone is naturally found in the stratosphere and its purpose is to block harmful UV rays from the sun. Similar to oxygen which has 2 oxygen atoms, ozone contains 3 and this extra oxygen atom is what gives it its properties. Thanks to this extra atom, ozone can completely eliminate several types of biological molecules such as bacteria, mold, spores and fungi among others. This happens because the extra atom basically gets separated from the other 2 oxygen atoms and binds to the harmful threat.

2. Ozone Generators In Cannabis

Ozone generators can produce ozone and get rid of pathogens and bugs easily, in cannabis grows, they’re not only used to keep the grow space clean and disease-free but also to help eliminate cannabis smell because, as mentioned, ozone eliminates all types of biological molecules in the air. An ozone generator may seem like a relatively cheap and effective way to keep your grow room sterilized and smell-proof, but why aren’t ozone generators very common?


Ozone generators in cannabis: what's ozone

Ozone has a structure similar to oxygen but with an extra oxygen molecule.

Well, in the first place, some growers claim ozone generators aren’t as effective as carbon filters and are a bit more expensive so it’s not worth it. Secondly, ozone generators are illegal in some countries because exposure to ozone for a prolonged time can irritate, damage the lungs, and can cause lung disease, so most growers tend to stay away from them. But, if used correctly, ozone generators can be of great help and it’s up to you to decide whether it’s useful or not.

3. Pros and Cons Of Using Ozone Generators

Just like anything else, ozone generators have their pros and cons, so here's a list to help you decide whether you should use one or not.

Pros Of Using Ozone Generators

As mentioned, ozone can hurt your lungs, which is a huge con, but if used properly you can effectively keep your grow space pathogen-free and eliminate the smell when you open the grow tent to water your plants, for example. So here are the main advantages of using an ozone generator when growing cannabis.

  • Effective disinfectant: Ozone is 250% more effective at killing fungi and pathogens than any product available. This means that just by pressing a button you can sterilize your grow space without having to clean all the equipment manually.
  • Eliminates smell: Ozone generators can effectively eliminate the cannabis smell produced by terpene molecules, and are especially helpful if you live in a place where cannabis is illegal. But due to being harmful, growers are migrating towards ozone generators that are designed to fit inside the exhaust tubes, thus reducing your exposure to ozone and making it safer. 
  • Cleans your hydro setup: As mentioned, ozone is harmful to your lungs but it’s a great way to keep your hydro setup clean without having to do much. So you can pump ozone into your water reservoir with an air stone, this way the ozone can kill algae or pathogens, saving you time and effort.


Ozone generators in cannabis: pros and cons

The pros and cons of using ozone generators when growing cannabis.

Cons Of Using Ozone Generators

There’s just one disadvantage to using ozone generators, but it’s a huge one. As you’ve read, ozone is harmful, this means it can harm you, your pet, or even your plants, so here are the main cons of using ozone generators.

  • Ozone can harm your lungs: The biggest disadvantage is that ozone is harmful, causing coughing, difficulty in breathing, and chest pain in more serious cases. Ozone can also aggravate pre-existing conditions such as asthma so you have to stay away from your grow room when the one generator is working.
  • It can harm cannabis plants: Too much ozone can end up suffocating your plants and inhibit chlorophyll production, which results in a lower photosynthesis rate. If exposed to high ozone concentrations, your plants can end up dying so it’s vital you control ozone levels in order to stay within the safe levels.
  • It’s hard to control ozone levels: The recommended ozone concentrations range between 0.1 ppm and 0.5 ppm but the ppm needed to effectively kill harmful bacteria is 25 ppm and these concentrations should be maintained for at least 20 minutes in order to remove bacteria effectively. So, when using ozone generators, you need special equipment to measure ozone concentration and ensure it’s between 0.1 - 0.5 ppm when you have to enter your grow space to work on your plants and 25 ppm for 20 minutes when you need to sterilize and eliminate the smell, which can be hard to do.

5. Top Safety Tips When Using Ozone Generators

Now, if you decide to use an ozone generator, here are the main tips you should follow to avoid health problems.


1. Use a generator suited for your grow space, if you choose a big ozone generator you won’t be able to control the levels, which will probably be too high. In case you don’t know which one to use, here’s a table to help you find the right one:

Ozone Generator Size by Grow Space Area

Ozone milligrams per hourSurrounding area
200 mg/H15 m2
500 mg/H40 m2
700 mg/H55 m2


2. Never breathe ozone. If you opt to use an ozone generator, leave the room immediately after turning the ozone generator on, and make sure you let the room ventilate for a couple of hours before entering your grow space.


3. In order to avoid problems, let everyone in your household know that you’re using an ozone generator and that ozone can be harmful.

6. Alternatives To Ozone Generators

If you don’t feel safe using an ozone generator around your family or pets, here are a couple of alternatives to ozone generators. Just remember that unlike a carbon filter (or ozone generator) these options will not eliminate the smell completely, they’re just a way to mask the smell.

Carbon Filter

Carbon filters use activated carbon to chemically absorb smells from the air and are probably the best option for most growers because they neutralize odors that pass through and are not harmful in any way or form. 


Ozone generators in cannabis: how ozone generators work

How ozone generators work.

Air Purifier

Air purifiers are another way to deal with cannabis smell but they do not eliminate the smell. Now, a purifier can help you reduce the smell but they’re not strong enough to eliminate all the smell in your grow room, so they’re not only recommended unless you can’t find or can’t afford a carbon filter.

Odor Neutralizer

Unlike a carbon filter, odor neutralizers don’t eliminate smell, odor neutralizers are designed to help mask the cannabis smell, this is why they usually have a very strong aroma. Obviously, it’s better to use odor neutralizers than to not use anything at all but these products can end up altering your plant's smell, so they’re not recommended unless it’s the only option you have left.

7. In Conclusion

Despite being harmful, you can take advantage of the benefits ozone generators provide by using them correctly. For most home growers, using a carbon filter is more than enough to get rid of the cannabis smell but if you need to use an ozone generator, make sure you use the appropriate ozone generator, this way you minimize risks.


If you are currently using an ozone generator, feel free to share your tips and tricks with fellow growers by leaving a comment in the comment section below!

19 August 2021