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Hands-on Gear Review

Aquamira Water Treatment Drops Review

Aquamira Water Treatment Drops
Top Pick Award
Price:   $15 List | $9.83 at Amazon
Compare prices at 2 resellers
Pros:  Smallest, lightest, most economical method, effective on viruses, trustworthy, simple.
Cons:  Somewhat long incubation time, adding chemicals to water.
Editors' Rating:     
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Manufacturer:   Aquamira

Our Verdict

Chlorine dioxide treatments like the Water Treatment Drops from Aquamira are the lightest and smallest water treatment method, making this system perfect for an emergency water treatment method or for weight-conscious hikers. We considered giving this treatment method a Best Buy award because it is so economical, but overall it is such an effective and simple method that we decided it was worthy of our Top Pick award for being light AND inexpensive.

Unlike iodine chemical treatment, chlorine dioxide is not harmful to ingest regularly and does eliminate Cryptosporidium, and unlike most pump filters, this method eliminates viruses. Besides the long incubation time, the primary downside to this method is that it involves adding chemicals to your drinking water, which puts off some users. If you want to protect yourself against viruses but don't like the idea of chemicals in your water, check out the MSR Guardian, which is the only filter effective against those types of diseases, though it is much heavier and expensive.

The Water Treatment Drops by Aquamira and MSR AquaTabs are inexpensive for a single package, which is nice for the wallet at the outset. If you travel in the backcountry often, a long lasting filter such as the MSR Miniworks EX or the Sawyer Complete Water Treatment System would be a better value, although they are not effective on as many pathogens. Another option, and one that only costs $20, is the LifeStraw. It weighs only 2.7 ounces and allows you to hike without carrying as much water (as long as you are 100 percent confident you will come across water).

RELATED REVIEW: The Best Backpacking Water Filters and Treatment Systems of 2017

select up to 5 products
Score Product Price Weight (including bag and all things that would be carried) Dimensions Filter Media
Editors' Choice Award
12 oz 3 in x 9.5 in Hollow Fiber
12.9 oz (Cartridge) 1.9 x 5.7 / (reservoir) 22 x 10 in Hollow Fiber
11.5 oz 10 x 6 x 2.4 in Pleated glassfiber/carbon
Best Buy Award
1.6 oz for filter alone, 2.5 oz for filter and bottle 5.5 in long 4 in diameter Hollow Fiber
Top Pick Award
22 oz 8.2 x 4.7 x 3.5 in Hollow Fiber
17 oz 20 x 10 in (per bladder) Hollow Fiber Membrane
13.65 oz 2 in wide x7.5 in long Silica Depth
Top Pick Award
3 oz with both bottles and mixing caps N/A Chlorine Dioxide
19.4 oz 7.5 x 4 in Pleated glassfiber, activated carbon granulate, ceramic pre-filter
2.7 oz 9 in long, 4 diameter Hollow Fiber Membrane
14.3 oz 3 x 6.5 x 2.4 in AntiClogTM pleated cartridge made with 0.3 micron glassfiber. Includes activated carbon granules
0.2 oz for 30 tablets N/A Sodium dichloroisocyanurate
6 oz 7.5 x 2.5 UV light
18 oz 2.75 in wide x 7.5 in long Ceramic Plus Carbon
16 oz 15 x 7 x 3.5 Hollow fiber membrane ultra filtration

Our Analysis and Hands-on Test Results

Review by:
Jessica Haist
Review Editor

Last Updated:
August 10, 2016

A chemical water treatment system, Aquamira stands out for being incredibly lightweight, compact, effective, and easy to use. This is the ideal method for hikers and backpackers trying to go light and fast.

Aquamira is a lightweight solution to purifying water in the backcountry.
Aquamira is a lightweight solution to purifying water in the backcountry.

Performance Comparison

The Aquamira Water Treatment Drops fell smack dab in the middle of our review in the Overall Performance metric. There are ups and downs to this water treatment method. Read on to learn more!


The active ingredient in these drops is chlorine dioxide, which doesn't actually contain chlorine. (Think bleach, but less harmful.) When researching on the Internet, it seems as though there is confusion as to what Aquamira actually treats, so we called them to get the full scoop: as of August of 2016 it was approved by the EPA as a purifier, which means that it eliminates all pathogens: bacteria, protozoa, and viruses, which is more than most filters. There is a difference in incubation time for some of the different organisms, but after an hour the drops are effective on everything, including Giardia and the hard-shelled Cryptosporidium.

It is trustworthy, and is an excellent method for particularly contaminated water sources since it works on a wider variety of diseases and can also treat the water on the threads of your bottle. The downside? You are adding a tiny bit of chemical to your water. However, whereas iodine is not healthy for you to ingest over extended periods of time, Aquamira drops are not harmful if used as directed. If you are looking for a similarly light, non-chemical treatment, the Sawyer Mini is a small filter option.

We interviewed a couple who thru-hiked the Appalachian Trail to see what they used for over 2,000 miles of hiking. They started their journey with a SteriPEN as their water treatment method because it was lighter than all the pump filters on the market, worked fast, and treated viruses. However, they soon became frustrated because the batteries would wear out very quickly. Eventually, the SteriPEN was broken after getting wet in a rainstorm and so the couple switched to Water Treatment Drops by Aquamira for the remainder of their hike, which was a more reliable system. They said that in their experience on the trail this was by far the most common method used by other hikers.

The taste of the chlorine dioxide is not bad. It adds a faint sterile flavor to the water, or some say it is citrusy. In the case of really gross water, it improves the taste of the water and eliminates odors. Aquamira does not filter out particulate as do all of the pumps, so try not to scoop up silty water. If you know you'll be somewhere with particularly silty water, consider bringing some other kind of filtration method, either in combination with Aquamira or on its own. The Lifestraw Mission filters out viruses and particulate, but is incredibly slow.

Adding Water Treatment Drops to water. This method is by far the most popular method for thru-hikers and lightweight backpackers due to its inexpensive price and extreme light weight.
Adding Water Treatment Drops to water. This method is by far the most popular method for thru-hikers and lightweight backpackers due to its inexpensive price and extreme light weight.

Ease of Use

Though using these drops requires an extra step other than just dropping a tablet in your water (like the Aquatabs), it is still very easy. The directions state that for each liter, add seven drops from each bottle, part A and part B, and wait five minutes for the mixture to activate and turn yellow. Then add it to your water and wait another 30 minutes for bacteria and viruses, 40 minutes for Giardia, and 45 minutes for Cryptosporidium (AquaTabs do not eliminate Cryptosporidium at all). After an hour everything should be eliminated. It is not uncommon to loose the little caps that come with these bottles. If you do, you can substitute the actual container lids to mix the chemicals - or use them in addition to the mixing cap if you have several people who want to treat their water at once.

Treatment Capacity

We prefer Aquamira over MSR AquaTabs because you can adjust the amount of chemicals you need for the volume of your water container. For instance, if you have a three-liter bladder, you can measure out the appropriate amount to treat exactly that.

We found the AquaTabs less versatile since they come in tablets meant to treat two liters of water each, so if you have a three-liter bladder, you either over treat for four liters or under treat for two. One package of Aquamira treats 30 gallons of water and should be ample treatment for any long backpacking trip. If you're hiking the PCT or AT, you may need to send yourself a new package along the way.
Adding water Treatment Drops and mixing caps lined up with the premixed parts A and B  waiting the required five minutes before adding to water.
Adding water Treatment Drops and mixing caps lined up with the premixed parts A and B, waiting the required five minutes before adding to water.


The initial activation of the liquids requires waiting five minutes. Once you add this mixture to your water, wait another 30 minutes to an hour for it to sterilize. You have to make the call if you're worried about viruses in the water or not - if you are traveling in Canada or the U.S., you shouldn't have to worry about this. This method is not as fast as a gravity-fed filter such as the Platypus GravityWorks, our Editors' Choice winner, but it does eliminate viruses as well, which the GravityWorks does not.


This system consists of two single ounce bottles, with the mixing caps weighing about three ounces. For shorter trips, the liquids can be decanted into smaller bottles to make for an even lighter system. With the exception of only carrying one or two of the MSR Aquatabs, this would be the lightest system. This is the most popular system for thru-hikers because it is so lightweight and also inexpensive. Waiting an hour can be a drag, but you do have the option of waiting for less time if you are only concerned about certain organisms.

Best Application

This method is very popular among long-distance hikers and is even advocated by NOLS instructors because of its light weight, ease of use, and effectiveness. It is much less bulky than a filter and has the added benefit of eliminating viruses; this is the best method for weight-conscious hikers. If you are planning to be in an area where there is a lot of silt in the water, consider bringing a more traditional filter like the MSR Sweetwater Microfilter.

Filling water in a stream along the Appalachian Trail before purifying.
Filling water in a stream along the Appalachian Trail before purifying.


If you are on a seriously small budget, and the initial price of a filtration system ($85-$350) is setting you back, a chlorine dioxide treatment such as this contender would be the least expensive option, which is one reason we give it our Top Pick award. The cost of $14.95 for two 1-ounce bottles will treat 30 gallons, or if you break it down, it averages to around 13 cents per liter treated.


Aquamira Treatment Drops receives our Top Pick Award because it is super light weight at three ounces and is the most versatile chemical treatment in this review. It is a great value choice and can treat anywhere from one to 100 liters at a time, depending on the need. Although it takes longer than a speedy gravity filter like the MSR AutoFlow Gravity Filter, it is much lighter, is inexpensive and it treats viruses if you are willing to wait the full hour. Toss it in your pack for day hikes where you'll need a refill or long through hikes. It also works well as a backup purifier if your primary filter fails on you.

Other Versions

Aquamira Water Purifier Tablets
  • Cost - $10.99 ($4 less than the Aquamira drops)
  • Weight - .7 oz (2 oz less than the Aquamira drops)
  • Will treat 20 L of water (almost 95L less than the Aquamira drops)
  • Solid tablets

Tangential Note: Dream Backpacking Gear List

Aquamira is one of many items featured in our Dream Backpacking Gear List. Check it out to see other top-tier "dream" backpacking items.
Jessica Haist

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Most recent review: August 10, 2016
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