The world's most in-depth and scientific reviews of outdoor gear

MSR Guardian Purifier Review

This investment provides unbeatable water quality all over the world.
Guardian Purifier
Top Pick Award
  • 1
  • 2
  • 3
  • 4
  • 5
Price:  $350 List | $349.95 at REI
Compare prices at 3 resellers
Pros:  Super fast flow, easy to use, very durable, self-cleaning, filters out viruses.
Cons:  Expensive, bulky, heavy, not first choice for backpacking in North America.
Manufacturer:   MSR
By Amber King ⋅ Senior Review Editor  ⋅  May 6, 2019
  • Share this article:
72
OVERALL
SCORE


RANKED
#7 of 18
  • Water Quality - 20% 9
  • Durability & Maintenance - 20% 9
  • Treatment Time - 15% 7
  • Weight & Packability - 15% 3
  • Ease of Set-Up - 15% 7
  • Ease of Filtration - 15% 7

Our Verdict

The MSR Guardian Purifier is truly the Cadillac of hand pump filters. It's fast, easy to use, and expensive. As one of the few filters that can extract viruses as well as bacteria and protozoan pathogens, it's at home in the backcountry and abroad. The water quality output is incredible, and the filter itself is insanely durable and self-cleaning. It does well in freezing, hot, and turbid water conditions. While we do love this filter, the Katadyn Hiker Pro is a lightweight and lower priced hand pump alternative. While it's not as fast as the MSR Guardian, it's still pretty darn efficient. It costs hundreds less, but it's also not as durable and more prone to clogging in turbid water than the Guardian.

If you're not sold on hand pump filters, gravity filters like the Platypus GravityWorks, our Editors' Choice winner, is another great alternative that requires a lot less work and can filter more water more quickly. If you are seeking a cheaper option that offers virus protection, check out the Aquamira Frontier Max, an in-line virus purification system that can also be used on its own. Its lifespan is only about 120 gallons in comparison to the Guardian's 10,000+ liters. As you can see, it's hard to beat MSR Guardian, which is why we've awarded it a Top Pick, even though it is a little heavier and more expensive than most options.


Compare to Similar Products

 
Guardian Purifier
Awards Top Pick Award Best Buy Award Editors' Choice Award   
Price $349.95 at REI
Compare at 3 sellers
$83.69 at Amazon
Compare at 3 sellers
$27.95 at REI
Compare at 2 sellers
$41.93 at REI
Compare at 2 sellers
$29.84 at Amazon
Compare at 2 sellers
Overall Score Sort Icon
100
0
72
100
0
77
100
0
75
100
0
75
100
0
73
Star Rating
  • 1
  • 2
  • 3
  • 4
  • 5
  • 1
  • 2
  • 3
  • 4
  • 5
  • 1
  • 2
  • 3
  • 4
  • 5
  • 1
  • 2
  • 3
  • 4
  • 5
  • 1
  • 2
  • 3
  • 4
  • 5
Pros Super fast flow, easy to use, very durable, self-cleaning, filters out viruses.Lightweight, great price, durable design, fast flow, high volume filtrationInexpensive, fantastic performance, great durability, versatile functionality, good water flow, lightweightHighly versatile, lightweight, in-line use, on-the-go useInexpensive, highly adaptable, lightweight, easy to use
Cons Expensive, bulky, heavy, not first choice for backpacking in North America.Doesn't filter out viruses, no additional storage reservoirClogs easily with lots of sedimentSlow flow rate, easy to lose small piecesSuction required, filter can come loose
Bottom Line This investment provides unbeatable water quality all over the world.The best value gravity filter on the market.This all-around awesome filtration system is the perfect personal use solution for water treatment.This highly versatile filtration system can be used with in-line systems and filters out viruses.This adaptor kit turns your favorite water bottle into an awesome water filtration solution.
Rating Categories MSR Guardian Purifier Katadyn Gravity Camp 6L Sawyer Micro Squeeze Aquamira Frontier Max LifeStraw Universal
Water Quality (20%)
10
0
9
10
0
7
10
0
7
10
0
10
10
0
8
Durability & Maintenance (20%)
10
0
9
10
0
9
10
0
7
10
0
7
10
0
6
Treatment Time (15%)
10
0
7
10
0
8
10
0
8
10
0
7
10
0
9
Weight & Packability (15%)
10
0
3
10
0
6
10
0
8
10
0
6
10
0
9
Ease Of Set Up (15%)
10
0
7
10
0
6
10
0
8
10
0
8
10
0
9
Ease Of Filtration (15%)
10
0
7
10
0
10
10
0
7
10
0
6
10
0
3
Specs MSR Guardian... Katadyn Gravity... Sawyer Micro Squeeze Aquamira Frontier... LifeStraw Universal
Type of Filter Hand pump Gravity filter On-the-go (straw & squeeze) On-the-go & in-line filtration On-the-go (bottle lid adaptors)
Time to Treat One Liter (Timed Test) 37 seconds 64 seconds immediate 2.5 minutes (gravity set-up) immediate
Measured Weight (entire kit -- oz) 20.5 oz 11.65 oz 3.8 oz 3.15 oz 3.7 oz
Storage Capacity Varies 6L Varies Varies Varies
Removes Bacteria? Yes Yes Yes Yes Yes
Removes Protozoa? (Cryptosporidium, Giardia Yes Yes Yes Yes Yes
Removes Viruses'? Yes No No Yes No
Removes Chemicals? No No No Yes Yes
Removes Heavy Metals? No No No Yes No
Removes Particulates (sediment, microplastics)? Yes Yes Yes Yes Yes
Filter Pore Size 0.02 microns 0.2 microns 0.1 micron Unknown 0.2 microns
Advertised Flow Rate 2.5L/min 2 L/min Varies 0.5 L/min Varies
Dimensions 8.2 x 4.7 x 3.5 in 10 x 6 x 2.4 in 15.5 x 6 x 1 in 7.5 x 1.8 x 9.5 in 8.7 x 4.5 x 3 in
Filter Media or Active Ingredient Hollow fiber Pleated glassfiber Hollow Fiber Unknown Hollow Fiber/ Carbon Filter
# of liters/galloons per lifetime 10,000+ liters/2,642+ gallons 1,500 liters/396 gallons 378,541 liters/100,000 gallons 454 liters/120 gallons 264 liters/1,000 gallons
Water Bottle Adapter Yes No Yes Yes Yes

Our Analysis and Test Results

The MSR Guardian is our favorite hand pump, winning our Top Pick Award. Although it's a little bulky and expensive, it's super easy to use and filters out everything from bacteria to viruses. This purifier can be used anywhere in the world, filtering out the meanest microbes to keep you healthy and happy while traveling internationally or heading into the backcountry.

Performance Comparison


The Guardian Purifier is at home anywhere in the world. Here we use it in the pristine alpine meadows in the Sierra Nevada. While this technology is a little overkill for this environment  it's a great option for travel abroad in developing nations.
The Guardian Purifier is at home anywhere in the world. Here we use it in the pristine alpine meadows in the Sierra Nevada. While this technology is a little overkill for this environment, it's a great option for travel abroad in developing nations.

Water Quality


This purifier comes with a kickin' filter with a pore size of 0.02 microns. Most filters in this review only have a pore size of 0.1 - 0.2 microns, but this one is capable of filtering out bacteria, protozoa, and viruses.


The filter has a hollow fiber design and produces water that is clean, healthy, and tasty.

The Guardian's unique hollow fiber filter.
The Guardian's unique hollow fiber filter.

Unfortunately, because it doesn't have activated carbon, it doesn't remove chemicals or odors. However, we are impressed that it's the only model that can stand up to the most turbid streams. This model is perfect for international travel or while backpacking with small groups.

The self-cleaning unit allows this purifier to get rid of particulates...even in the most turbid rivers.

Durability and Maintenance


This water filter is exceptionally well-constructed and quite durable. Not only has it been drop tested up to six feet on concrete, but it can withstand freezing temperatures! Maintenance is minuscule. Every time you pump the filter, it is continually self-cleaned with every stroked. Unlike other models, the filter doesn't get clogged easily, even in turbid water.


This bomber design is highly reliable. The filter itself will last up to 10,000+ liters, which is far more than any of the gravity filters that we've tested. Of the purifying systems, this has by far the most extended lifespan that we've seen that can remove viruses. For example, the Aquamira Frontier Max only has a lifespan of 120 gallons or roughly 450 gallons and a much shorter lifespan than the MSR Guardian. If a reliable and well-built machine is what you're after, this handpump is our favorite — self-cleaning, low maintenance, with a wide range of applications.

A look at the double intake hose and some key construction features.

Treatment Time


In comparison to other hand-filters, this is the fastest, and one of the fastest filtration systems, period! After three trials, it produced, on average, one liter in 37 seconds. This fact makes the MSR Guardian Purifier a high-output hand pump, beating out the Katadyn Hiker Pro that averaged 56 seconds per liter. Overall, you don't have to worry about the filtration process taking forever. It's quick and easy to use.


We are surprised how easy and fast the MSR Guardian is to pump.
We are surprised how easy and fast the MSR Guardian is to pump.

Weight and Packability


While this purifier is super fast, providing amazing water quality, it's heavy and pretty bulky. Weighing 1 lb 4.50 oz, it's one of the heaviest filtration systems out there. In terms of its volume, it's rather bulky and is a little larger than a Nalgene bottle. We like that it doesn't have a lot of loose parts and comes packaged nicely in its included carry case.


Its weight and bulky nature is a bummer, but the Katadyn Hiker Pro offers a friendly alternative, weighing just 13.40 oz with a packing size that's smaller than the Guardian. This filter is a good alternative if you don't need a purifier, and a filter that gets rids of bacteria and protozoan organisms will do. It's also a lot cheaper and suited for use all over North America. However, if a purifier is what you seek, this is our favorite hand pump, despite its larger size.

A look at the relative sizes of other handpumps like the MSR Guardian. The Katadyn Hiker Pro is much smaller  offering better functionality as a backcountry water filtration option for those who are weight conscious.

While this is not the lightest system  it still packs down relatively small. Here we see comparisons with the Katadyn Light Hiker  another hand pump that doesn't filter out viruses.
While this is not the lightest system, it still packs down relatively small. Here we see comparisons with the Katadyn Light Hiker, another hand pump that doesn't filter out viruses.

Ease of Setup


Setting up this filter is easy. In the box it comes with all parts together and intact. There are no loose parts that you might lose. Pull it out of its pouch, take off the cover, and place the hose in the water for direct filtration.


The handpump setup allows you to direct the intake hose to any water source. It works well in medium size water sources, but can also be used in small puddles or hard-to-reach areas like steep banks or off the side of a boat. The hose also features a mini-filter screen that will sift out larger particulates, so your hand pump filter doesn't need to deal with algae or debris sitting in the water — it's pre-filtered first.


The Guardian has no assembly required  is simply to use  with some key engineering that makes filtration easier.
The Guardian has no assembly required, is simply to use, with some key engineering that makes filtration easier.

Ease of Filtration


As a handpump, it's not hard to use at all. The large handle is super easy to grab and the cartridge body provides another place to hold the pump firmly. When pumping, the high flow output easily sucks water and pushes all of it out in one cycle. Of all handpumps we've tried, it's one of the easiest to use, making filtration nice and easy.


The only real issue we've come across is that sometimes the intake hose's float gets turned around in the water source, and sucking becomes less efficient. Therefore, you need to watch and make sure that it is in position for the most efficient pump action. It may also present a problem in shallow or small water sources because the float is quite large. Also, this pump comes with a bottle top adaptor that fits most wide-mouth water storage containers. You can also easily screw on a Nalgene bottle to the bottom of the filter. If neither of those work, pump into your water storage container.

The Guardian self cleans with every stroke  sucking water in through one hose and the purged water back out the other.
The Guardian comes with a bottle adapter.

While this is a smooth hand pump to use, hand pumping in general kind of sucks. Hand pumping requires a lot of effort, forces you to sit in one spot and not accomplish other tasks around camp, and can take a while. While it does provide an excellent output, if you can swing it, a gravity filtration setup is preferable and is a lot less work. But, it can't access the same hard-to-reach water sources.

Pumping purified water into a wide-mouth Nalgene works well.
Pumping purified water into a wide-mouth Nalgene works well.

Best Applications


We recommend this bomber purifier for any trip to your favorite international destination. If you're okay with the extra bulk and weight, it's also a prime option for any weekend or multi-day backpacking trip. Use it personally or with a small group of friends. Also because of its resilience in the cold, don't be afraid to use it for winter camping if you're not going to be melting snow and boiling water. Access hard to reach water sources like small, shallow streams or use it off the side of a boat. Overall, a wonderful handpump with a wide range of applications.

The Guardian is a great choice for group trips  especially international ones where virus-contaminated water is an issue.
The Guardian is a great choice for group trips, especially international ones where virus-contaminated water is an issue.

Value


So now that you've fallen in love with this filtration system, we're going to offer a kick in the pants: the price. Retailing for $350, it is the most expensive filter or purification system in this review. Most people don't have this kind of cash to throw down on a system that purifies water. That said, the investment is worth it for the durability of the product. Don't expect to buy another one for your lifetime. If you're a guide or a service looking for an option that will continue working for you, this model is good for multiple uses. And with its ease of use, it works for anybody. Since its niche is in its ability to filter out viruses, which we don't require in North America, there are better options for a much better price if you stay stateside. For example; the Katadyn Hiker Pro that retails for only $75. It's just not as durable or versatile.

Conclusion


The MSR Guardian Purifier stands out as an easy to use handpump that can get rid of viruses along with everything else. Its hefty price and heavier weight are two big downsides that might have some people looking in other places. Although, if you can afford it and you don't mind the extra weight, it's a perfect companion on any backcountry mission or international trip. If you're looking for something that can do it all, this is truly it.


Amber King