Guardian Purifier
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Read the Review
Read the Review
Read the Review
Read the Review
Awards Top Pick Award Top Pick Award Best Buy Award Editors' Choice Award Top Pick Award 
Price $349.95 at REI$36.89 at Amazon
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$77.97 at Amazon
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$29.97 at Amazon
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$14.95 at REI
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Overall Score Sort Icon
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72
Star Rating
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Pros Super fast flow, easy to use, very durable, self-cleaning, filters out viruses, can be frozen, excellent long-term valueEasy to use, fast flow rate, collapsible, lightweightLightweight, great price, durable design, fast flow, high volume filtration, use for cold weatherLightweight, adaptable, easy to use, lifetime guaranteeLightweight, inexpensive, kills all pathogens (including crypto), reliable
Cons Expensive, bulky, heavy, excessive for use in North AmericaLacks durability and reliabilityDoesn't filter out viruses, no additional storage reservoirNot great for group use, better if you replace the bagsTakes a long time to kill crypto, slight taste to the water, chemical treatment
Bottom Line This hand pump purifier can be used anywhere in the worldA soft bottle filtration system designed for lightweight travelA convenient and easy-to-use gravity filter at a great priceThis lifetime guaranteed product is easy to use on the trailThe best chemical treatment option that will kill all pathogens when given enough time
Rating Categories MSR Guardian Purifier Katadyn BeFree Katadyn Gravity Camp 6L Sawyer Squeeze Water Treatment Drops
Water Quality (20%)
9
8
8
8
5
Durability & Maintenance (20%)
9
1
7
5
10
Treatment Time (15%)
8
10
8
9
2
Weight & Packability (15%)
2
10
6
7
9
Ease Of Set Up (15%)
8
9
6
7
8
Ease Of Filtration (15%)
6
9
9
8
9
Specs MSR Guardian... Katadyn BeFree Katadyn Gravity... Sawyer Squeeze Water Treatment...
Type of Filter/Purifier Hand pump Squeeze & on-the-go Gravity filter Squeeze, in-line, on-the-go Chemical treatment
Time to Treat One Liter (Timed Test) 37 seconds immediate 64 seconds 40 seconds Clear Water - 20 min
Turbid Water - 35 min
Measured Weight (entire kit -- oz) 20.5 oz 2.1 oz 11.7 oz 5.7 oz 3.0 oz
Total cost per 100 L ($) $3.50 $4.00 $6.00 $0.01 $13.16
Replacement cartridge cost per 100 L ($) $1.80 $2.50 $2.67 $0.01 $13.16
# of Liters (L)/gallons (gal) per lifetime 10,000+ L/2,642+ gal 1000 L/264 gal 1,500 L/396 gal 378,541 L/100,000 gal 114 L/30 gal per package
Filter Media or Active Ingredient Hollow fiber Hollow Fiber Pleated glassfiber Hollow Fiber Chlorine Dioxide
Removes Bacteria? Yes Yes Yes Yes Yes
Removes Protozoa? (Cryptosporidium, Giardia) Yes Yes Yes Yes Yes
Removes Viruses'? Yes No No No Yes
Removes Chemicals? No No No No No
Removes Heavy Metals? No No No No No
Removes Particulates (sediment, microplastics)? Yes Yes Yes Yes No
Filter Pore Size 0.02 microns 0.1 micron 0.2 microns 0.1 micron N/A
Advertised Flow Rate 2.5L/min 2.11 L per min 2 L/min 1.7L/min N/A
Dimensions 8.2 x 4.7 x 3.5 in 9.05 in x 2.73 in 10 x 6 x 2.4 in 11 x 6 N/A
Storage Capacity (L) 0 0.6 L 6 L 0 0
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