The Greentech Environmental GT3000 air purifier is a high-end air purifier with a hefty price tag and mind-boggling technology. It’s not the stock standard purifier with an HEPA filter, carbon filter and perhaps a bonus filter. No, it has all kinds of tech which we will get into further down. It pulverizes mold, odors, bacteria, viruses and all kinds of things you don’t want zooming into your lungs.

This is one of those machines which looks amazing on paper. It sweet talks the consumer with all the right things to say. And perhaps those promises are entirely true. However, it’s hard not to take into account the concerns of other customers and those who have stayed well away.

One thing’s for sure is that it’s the kind of appliance that you have to take responsibility for, and use it according to the very adamant safety warnings.

How much ozone does the Greentech GT3000 produce? Is it an easy-to-use machine? Is it easy to clean or a bit cumbersome? Are people simply using the machine incorrectly or does it really emit a bad smell?

Let’s find out.

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What Interesting About The Greentech GT3000?

There are many interesting aspects about this air purifier. For one, the opposing experiences and subsequent reviews by customers are very telling. Some people hate it, claiming awful smells and an impractical design. While others insist that the negative reviewers simply aren’t using the machine correctly.

GT3000 Professional-Grade Advanced Air Purification System by GreenTech Environmental

One of the most interesting aspects is the ozone issue. This air purifier creates ozone. It has all kinds of technology including an ionizing needle and a purification plate which gives off ozone. We will move onto the issue of ozone further below, but it’s safe to say that it’s an issue for many existing and potential customers.

Ozone can be very problematic for people with allergies and asthma, often rendering the benefits of an air purifier completely null if the ozone levels are too high.

The GT3000 has what’s called an “away mode”. This mode is designed to thoroughly purify the area by using a higher density of ozone. Users are warned NOT to use this mode unless the room or home is unoccupied as the ozone levels are dangerous.

Is it good to reduce dust and remove tobacco and pet odors or diaper?

Yes, customers have had really good experiences with odor reduction. The cleaning technology is designed to kill bacteria and thoroughly eliminate odors. It’s definitely a pretty comprehensive machine and I am sure the odors are well and truly destroyed, but the concern is that many customers have reported a bad smell coming from the machine.

As mentioned before, it is yet to be determined if the odors are a result of the machine not being used properly, or if it really does produce a nasty odor. A potential explanation is that the users are logging in a higher square footage than what their room really requires, therefore overloading it with odorous ozone. Mysterious indeed. 

Does it have an ionizer? and is it safe?

The short of it? It does have an ionizer and it does produce ozone.  

The ozone densities for this air purifier are as follows: up to 360mg/hour on “away” mode and up to 25/300mg/hour in “high” mode. That probably doesn’t mean much to you unless you’ve delved into the digits and abbreviations of ozone levels…not the most exciting reading material. But what the manufacturers also reveal is more intriguing:

They state that the machine won’t create “an environment with an ozone density of more than 0.05 ppm (excluding “away mode”)”. So that should mean that the “away” mode creates a higher density of ozone. So what does this mean? Well, according to the FDA and OSHA, the safety standard is up to 0.05 ppm, so this machine is just on the cusp. It makes sense that the manual has a “warnings” page which includes a warning related to the “away” mode.

It advises not to use this mode unless the room is empty. It then states; “short term exposure to ozone levels exceeding 0.05 ppm can cause temporary adverse reactions.” 

The bottom line? If you’re really worried about ozone I’d simply choose another model. Not to say that this one is necessarily harmful, but it does require some care when operating it to make sure it remains safe and healthy.

What do other customers and reviews say?

There are plenty of mixed reviews for this machine, some love it and some really…do not. Specifically, 67% of the reviewers rewarded the unit with 5 stars and 12% gave a pitiful 1 star. But why? Let’s see.


Reduces allergy symptoms: a handful of reviewers specifically noted that they experienced a great reduction in allergy symptoms once they installed this unit. 

Cleans and deodorizes the air: interestingly, many customers found that the air in their homes was noticeably fresher and cleaner than ever before. They noticed a great reduction in household odors and were adamant that the reviewers who experienced a bad ozone smell weren’t using the machine correctly. 


Gives off bad smell: a common comment in the negative review sections is that this air purifier gives off an odd, unpleasant odor while in operation. This has been so bad for some people that they’ve stopped using it. The manual does state that you have to manage the way you use the modes carefully to ensure a safe operation. This could be part of the reason behind why some people experienced a bad smell but I can’t say for sure.

What are the technical specifications?


Recommended room area: 250 to 3000 square feet
Special features/settings: Remote control: it has all of the control buttons you need to set and adjust the unit. You can also dim the unit lights by using the “sleep” button on the remote control

“Away” mode: for times when a particular part of your home is very polluted and needs a thorough clean with higher ozone levels. All people and pets must be out of the room or “away” while this feature is in use.

“High” mode: for using when the air is particularly full of odor, mold spores and other airborne particles you’d rather not have hanging around. You have to gradually increase the purification level when using this mode.

Fan speed: adjust the fan speed using up/down buttons

Timer: the timer is used when the “away” mode is selected. You can opt for 2, 4, 6 or 8 hours.

Purifier setting: this is the button you use when you need to select the room area when using the “high” mode. You figure out the overall square footage of your home or space and increase the purification level every 24 hours until it reaches the maximum square footage of your space.

Filter or cleaning type/s:

Advanced Photo Catalytic Oxidization (aka “PCO cell”)

Scalable Purification

Needlepoint Ionization

Electrostatic Filtration

Optional: harsh environment pre-filter

Optional: HEPA type pre-filter

Energy usage: 100-240V, 50-60Hz, 45W

Color  black
Noise level (Db) customers have not complained about the noise so it’s safe to say it’s quiet enough for most people’s standards

Dimensions and weight

Size 9 x 12 x 11.75 inches
Weight 10.2 pounds

How do you use it?

This is definitely the kind of appliance which requires a thorough read of the manual as it’s a little more complex than many other air purifiers. But here’s a quick rundown of what to expect…

The initial set-up is as follows (roughly):

  • Never place the purifier on the floor (needs to be set on a table or platform), the higher the better
  • Leave plenty of space around it
  • Plug the cord into the unit then into the power outlet

When operating:

When using “high” mode you must gradually increase the purification level according to the area of the room you are cleaning. This means that if you want to clean your entire house, bump up the purification level every 24 hours until it reaches the area of your whole home.

Only use the “away” mode when the air is thick with odors or allergens. Once you’ve selected the “away” mode, set the time for how long you’ll be away. Once it’s all set, gather your family and pets and ensure they stay out of the room.

Otherwise you can simply leave it on “normal” and adjust the fan speeds according to the condition of the air.

How do you clean it? Is it easy to clean?

No, the cleaning process isn’t easy compared to other machines which need a simple wash, dry and reassembly. There are quite a few steps you need to take to complete a full clean. It’s recommended that the unit, filters and other cleaning parts are cleaned at least monthly, but ideally weekly.

Exterior unit: just needs a quick wipe with a damp cloth. You can also use your vacuum cleaner with the brush attachment on the end of the wand.

Filter assembly: this is the part which looks like a plain grille which sits at the back of the machine, covering the filters. It’s not too delicate and can be washed with plain water and fully dried.

Ionization needle: it’s advised to use a little cotton bud (Q-tip) moistened with rubbing alcohol to clean this delicate part.

PCO cell: the only option is to brush the PCO cell with a duster or a quick once-over with a vacuum cleaner. No liquids allowed.

Purification plate: use water and ammonia or white vinegar. Soak in the solution for up to but no longer than 12 hours. 8 to 10 hours is recommended. You can use a soft brush to remove any stuck gunk. Rinse then thoroughly dry.

What is the cost of replacement filters and where to get them?

These replacement filters are available from the Greentech website:

  • Rear filter assembly: $29.95
  • Purification plate: $24.99
  • Harsh environment filters: $49.00
  • PCO cell: $89.97

How often do filters need to be changed and can’t they just be cleaned?

As explored above, the filters and parts can be cleaned, but via different methods. Some can be washed, some must only be dry-dusted, one needs an alcohol-soaked Q-tip and one needs an overnight soaking.

The PCO Cell has a bulb inside it which must be replaced once a year or else it will burn out and become useless.

Are there other replacement parts, where do I buy them?

The Greentech website sells these replacement parts (prices above):

  • Rear filter assembly
  • Ozone purification plate
  • PCO cell
  • Harsh Environment Pre-Filter pack

Greentech also offers an Ozone Plate Cleaning Kit

How loud is it?

I haven’t come across any complaints regarding the noise, and it is advertised as ultra quiet. Therefore I think it’s safe to say that it’s quiet enough for most people’s preferences. 

What’s the warranty?

1 year limited warranty

What’s The Best Price For The Greentech GT3000 and where can I buy it?

The Greentech website sells the GT3000 for $960.00

Verdict: Is This Air Purifier For You?

This is a tricky one to decipher because of so many factors. It’s got a high price tag, concerns surrounding ozone and more complicated operation processes than other air purifiers out there. However, many people absolutely sing the praises of this machine and swear they’ve never felt healthier. It’s the kind of air purifier you buy if you’re prepared to use it properly and adhere to the instructions and warnings in the manual to get the very best result.

If I had to make a call, I would honestly say that I would go for a far cheaper option with less controversial features. Levoit make some great air purifiers at a far cheaper price, with more attractive aesthetics and safer filtration systems. They may not absolutely eviscerate airborne bacteria and odors but they do a great job at creating a healthier environment.

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