Ozonics HR500 Review: My 45-Day Field Test

I used the Ozonics HR500 for 45 days during Pennsylvania’s archery season. I carried it into real saddle-hunting setups, mounted it above me, hunted changing winds, and used the DriWash Bag and Micro3 between hunts.

I started this test as a skeptic. Adding about two pounds and more bulk to a mobile setup needs to solve a real problem. By the end of the test, the HR500 had performed better than I expected, but it did not change my first rule of scent control: you still have to hunt the wind and thermals.

Important update: I tested the HR500, not the newer HR600. The HR500 is now the older model, so I added a current-model comparison below. Any comments I make about deer encounters, sound, carrying weight, mounting, and field performance come from my HR500 test.

Ozonics provided the HR500, DriWash Bag, and Micro3 for this review. I was not paid to give the products a positive review.

My Bottom Line

The HR500 earned my trust as a scent-control tool, especially during marginal wind shifts and multi-day hunts. I had three bucks enter directly downwind during the test, and none reacted the way I normally expect when a deer clearly identifies human scent. I also liked the DriWash system more than I expected.

• Best for: Hunters who want another layer of scent control and are willing to carry the extra weight and bulk
• What stood out: Three downwind buck encounters, all-day HR500 battery life, easy Smart Arm positioning, and useful DriWash performance
• Main drawbacks: Price, pack space, about two pounds of added carry weight, and more fan noise in Hyperboost
• What it does not replace: Wind planning, thermal knowledge, clean access, and a complete scent-control routine

2026 Update: Ozonics HR500 vs. HR600

The HR600 is Ozonics’ current flagship. I have not field-tested it, so the information in this section comes from Ozonics’ published specifications. The important question is whether the updates solve problems I noticed with the HR500.

HR500: The Model I Tested

• 16-ounce device with an XL battery rated for up to 10 hours
• Standard, Boost, Hyperboost, and DriWash operating modes, plus app controls
• Smart Arm mounting system and Bluetooth control
• Proven in the 45-day field test described in this review

HR600: The Current Model

• The same listed 16-ounce device weight, with an XL battery rated for up to 13 hours
• A new toolless replaceable coil that Ozonics says produces 20% more ozone than its previous units
• A redesigned fan with a top-mounted air intake
• Integrated on-board charging and updated battery technology
• Standard, Boost, Hyperboost, and DriWash modes, plus an app-only Locker mode

On paper, the HR600 improves battery life, serviceability, airflow, and ozone output without making the device heavier. Those are useful upgrades. Still, my recommendation is based on the HR500 I actually used. Read the official HR600 specifications before buying because packages and included accessories can change.

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Why I Decided to Test the HR500

As a bow hunter who values mobility and packing light, adding another item to my gear was the last thing I wanted to do. But, my role in testing and reviewing bow hunting equipment for you here and on The Everyday Bow Hunter YouTube channel led me to an interesting opportunity – reviewing the Ozonics HR500.

Initially, I was skeptical. The truth is, I would’ve never picked it up on my own. But that’s exactly why I thought I’d be the perfect person to give you an honest, no-frills review. So, I took on the challenge.

I was given the following items to conduct this review:

• Ozonics HR500 unit – Scent Eliminating Ozone Generator with smart arm mounting system and molded tree screw-in mount.
• Ozonics DriWash Bag – Bag for deodorizing your hunting clothes between hunts
• Ozonics Micro3 – Car Ozone Generator

My Season Long HR500 Field Test

Ozonics says the HR500 creates an ozone stream on the downwind side that changes human odor molecules and makes that scent harder for deer to identify. The unit is designed to hang 6-12 inches above the hunter and angle about 30 degrees into the downwind scent stream. That is the manufacturer’s explanation. My job in this review was to see how deer behaved around it in the field.

The HR500 unit comes with a smart arm mounting system, an extra large-capacity battery (XL), and a tree screw-in mount. Since I am a mobile public land hunter, I purchased the Ozonics Cam Buckle Smart Tree Mount so I wouldn’t have to tear up any trees when mounting the unit.

Mounting

I hunted from my tree saddle most of the season and occasionally used my Novix Helo hang-on stand as well. Mounting the HR500 the first time was an event, but I quickly learned that the smart arm and cam buckle strap I purchased made things very easy and after my initial learning curve, I was able to mount the unit in any tree I hunted within 2-3 minutes.

The smart arm mount makes it extremely easy to make adjustments to the position of the unit when the wind changes or when you feel a small adjustment to positioning is needed. It is a very good setup and very solid.

I will say that the cam buckle strap mount made things exceptionally easy to mount, but even easier to change positions when the wind changed. If you use the molded tree screw-in mount, it won’t be nearly as easy or timely. If you have other screw-in mounts, you know how frustrating they can be on different trees. The cam buckle strap is definitely the best option for mounting and I highly recommend it.

*I did not mount the unit any other way, nor did I ground hunt with it so I cannot comment on using it in a blind or a ground setup.

Weight

As a mobile bow hunter, adding something more to my pack wasn’t something I really wanted to do, but for this field test, I bit the bullet and made it a part of my packing list. The weight of the unit is listed at 16 ounces and the XL battery is listed at 340 grams (.75 lbs). This adds about two (2) pounds to your pack, so be prepared for that.

I definitely noticed the additional weight during my Ozonics HR500 review, but I noticed the additional bulk of the unit even more. You need to have a good pack to carry it and to keep it from getting damaged. I used the Trophyline Palisade pack this season and this helped offer the unit some protection when carrying it. The Palisade is a molded pack built for protecting gear like this.

Scent Elimination Field Test

I wanted to really challenge the unit while doing the HR500 review this season. It is very hard to determine if a deer has smelled you or not and even harder to put yourself in a position where you know they will come downwind of your stand. I knew testing this would be a challenge, so I set out to purposely hunt locations when my wind was not optimal for the hunt. I didn’t like the possibility of wasting hunts just to test this, but I didn’t see any other way to really challenge the HR500.

Throughout the Pennsylvania Archery Season, I had three (3) unique situations where I had bucks come directly to the tree I was hunting in from my downwind side. The first had a big-bodied 6-point come from my uphill, downwind side as thermals were pulling my scent up the mountain.

At approximately 25 yards, the buck knew something was different and put his nose up and licked it trying to figure out what he was smelling. He then relaxed and worked his way directly downwind of my tree and got to as close as 10 yards, almost at eye level due to the slope.

He stood there and fed for about five minutes until I moved to adjust my camera and he moved laterally to about 20 yards. He continued feeding and was never spooked to run away. The wind speed was approximately 4-5 MPH.

I had two similar encounters through the season with another 6-point and a small 4-point. I did not have any older mature bucks come into my stand location from the downwind side. I noticed that with all these situations, the wind speed was never gusting past 15 MPH. I did not have any deer come into me from the downwind side at wind speeds higher than that.

*One thing to note, this was the first archery season I can remember where I didn’t get snorted by a deer (buck or doe) at least once. While I didn’t really think of it through the season, now it seems like something important to point out. I am very good at hunting the wind and thermals, but everyone gets busted from time to time. This year I didn’t.

What My Field Test Can and Cannot Prove

This was a real hunting test, not a controlled laboratory study. I cannot prove exactly what those deer smelled, and I cannot promise that the same deer would have reacted differently without the HR500 running.

What I can say is that three bucks entered directly downwind, including one that fed as close as 10 yards, and none reacted the way I normally expect when a deer clearly identifies human scent. I also went through the season without getting snorted at from the stand. Those observations are meaningful to me, but I will not turn them into a guarantee.

The wind still matters. Thermals still matter. Your access route, clothing, sweat, and ground scent still matter. I see Ozonics as an added layer for small wind shifts and imperfect real-world conditions, not as a reason to hunt a setup with the wrong wind.

Ozonics HR500 Mobile App and Settings

It is important to know that the HR500 comes with a mobile app that connects to the unit from your phone via Bluetooth. It has multiple settings on it that can be adjusted based on wind speed and using the unit to remove odor from your hunting gear.

These settings include:

• Standard – for very light or no wind
• Boost – to be used in most situations and up to around 10-15 MPH winds
• Hyperboost – any wind over 15 MPH
• DriWash – to be used with the Ozonics DriWash Bag
• Locker Wash – to be used with the Ozonics Locker.

In most cases, I used the Boost mode when hunting. In higher winds, I did use the Hyperboost setting. The setting I used the most was the DriWash setting. I’ll get into that more below.

Sound: How Quiet is the HR500?

Ozonics claims that the HR500 is 40% quieter than the OrionX and HR300 models. I haven’t tested those so I cannot say if this is true. That being said, I thought that when using the unit in Boost mode it was fairly quiet and the deer that were around me throughout the season never looked up at me due to the sound of the unit.

I had quite a few deer as close as two (2) yards who never looked up at me with the unit running and I hunt in the mountains of central Pennsylvania where deer are very skittish and will jump at the slightest movement if they see you.

When I had the unit in Hyperboost mode, it seemed loud to me. When winds would die down at different times, I thought it was almost too loud. If the older units are louder, I don’t know if I would want to use those. The HR500 on the other hand was pretty good when matched with the right corresponding winds.

DriWash Bag and the HR500

The thing I probably used the most during the course of this review was the combination of the HR500 and the Ozonics DriWash Bag. I am religious about keeping my clothes clean and scent-free, but we all know that it only takes one hunt to sweat out, soil your clothing, and have it all smelling pretty bad.

I was able to consistently hang my dirty hunting clothes in the DriWash Bag and run the HR500 on DriWash mode. This was a 10-minute cycle where I would run it once, turn my clothes inside out, and run it again.

For any of you who do multiple-day hunts or travel to hunt without access to a washing machine, being able to reduce clothing odor between hunts is a real asset. During the last week of bow season, I hunted almost all day for six straight days. The HR500 and DriWash Bag kept my clothes smelling much fresher to me even though they were dirty and sweaty.

I found this to be one of the most useful parts of the system. The DriWash Bag controls the airflow around the clothing instead of releasing the ozone into a room, and that made it practical at the cabin and during multi-day hunts.

*My Field and Stream rubber boots started smelling really bad near the end of the season. I put them in the dry wash bag and ran the 10-minute cycle. They still smelled bad. I ran it again, still bad, but better. I ended up running it six (6) times before it seemed like all the odor in the boots was gone. That was pretty awesome.

The Micro3 Car Ozone Generator

I probably misspoke when I said I used the DriWash Bag the most. The thing I used every single day was the Micro3 Car Ozone Generator. I would get my gear ready for the next hunt, put it in the car (my little 2015 Subaru Crosstrek), and then I would let the Micro3 run for its automatic 20-minute cycle.

I felt that my gear was largely odor-free (to me). Of course, what the deer can smell is very different. But, I was able to minimize the odor and minimize its signature. That was an easy win for me during this review.

What I Learned After 45 Days

The HR500 performed above my expectations. I cannot prove what each deer smelled, but I had several encounters where I expected to get busted and did not. The unit was also more useful between hunts than I expected because of the DriWash Bag and Micro3.

It was not perfect. The system takes up room in a mobile pack, adds about two pounds with the battery and mounting gear, and can sound loud in Hyperboost when the wind drops. Those are real tradeoffs, especially for a hunter who carries everything deep into public land.

Pros

• Three bucks entered directly downwind without giving me the reaction I normally expect after being clearly winded
• No deer snorted at me from the stand during the test season
• The Smart Arm and cam buckle mount made positioning and wind adjustments easy
• The XL battery lasted through my hunting day
• The app was useful when the unit was mounted above me
• The DriWash Bag was valuable during multi-day hunts

Cons

• It is impossible to know exactly what a deer smelled in an uncontrolled field encounter
• The complete carry setup adds about two pounds and noticeable bulk
• Hyperboost can sound loud when the wind drops
• There is a learning curve to mounting and aiming it correctly
• The price makes it a serious purchase, not a basic piece of scent-control gear

Should You Buy It?

If you already understand the wind and want another layer of protection for small shifts, swirling mountain air, and long sits, the Ozonics system is worth considering. It also makes more sense for hunters who will use the DriWash feature during multi-day hunts.

I would skip it if you expect a machine to fix bad access, poor wind planning, or dirty hunting habits. I would also think hard about it if every pound and every inch of pack space matters more than added scent control.

My field experience applies to the HR500. If I were buying new today, I would compare remaining HR500 inventory against the HR600. The HR600’s longer battery rating, replaceable coil, and redesigned fan are meaningful updates, but they are manufacturer claims until I test the new unit myself.

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