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Read the Review
Read the Review
Read the Review
Read the Review
Awards Top Pick Award Editors' Choice Award Top Pick Award Best Buy Award Editors' Choice Award 
Price $14.95 at REI
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$109.95 at REI
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$38.72 at Amazon
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$89.95 at REI
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$29.97 at Amazon
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Overall Score Sort Icon
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73
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Pros Lightweight, inexpensive, kills all pathogens (including crypto), reliableFast, easy, hands-free filtration, large volume, storageEasy to use, fast flow rate, collapsible, lightweightLightweight, great price, durable design, fast flow, high volume filtration, use for cold weatherLightweight, adaptable, easy to use, lifetime guarantee
Cons Takes a long time to kill crypto, slight taste to the water, chemical treatmentA little expensive, can't gather from shallow sources, clogs with heavy sedimentLacks durability and reliabilityDoesn't filter out viruses, no additional storage reservoirNot great for group use, better if you replace the bags
Bottom Line The best chemical treatment option that will kill all pathogens when given enough timeA low maintenance, easy-to-use gravity filter that works well for everybody on the trailA soft bottle filtration system designed for lightweight travelThe best value gravity filter on the marketThis lifetime guaranteed product is easy to use on the trail
Rating Categories Water Treatment Drops Platypus GravityWorks Katadyn BeFree Katadyn Gravity Camp 6L Sawyer Squeeze
Water Quality (20%)
5
8
8
8
8
Durability & Maintenance (20%)
10
6
1
7
5
Treatment Time (15%)
2
9
10
8
9
Weight & Packability (15%)
9
7
10
6
7
Ease Of Set Up (15%)
8
7
9
6
7
Ease Of Filtration (15%)
9
9
9
9
8
Specs Water Treatment... Platypus... Katadyn BeFree Katadyn Gravity... Sawyer Squeeze
Type of Filter/Purifier Chemical treatment Gravity filter Squeeze & on-the-go Gravity filter Squeeze, in-line, on-the-go
Time to Treat One Liter (Timed Test) Clear Water - 20 min
Turbid Water - 35 min
52 seconds immediate 64 seconds 40 seconds
Measured Weight (entire kit -- oz) 3.0 oz 11.5 oz 2.1 oz 11.7 oz 5.7 oz
Total cost per 100 L ($) $13.16 $7.33 $4.00 $6.00 $0.01
Replacement cartridge cost per 100 L ($) $13.16 $3.67 $2.50 $2.67 $0.01
# of Liters (L)/gallons (gal) per lifetime 114 L/30 gal per package 1,500 L/396 gal 1000 L/264 gal 1,500 L/396 gal 378,541 L/100,000 gal
Filter Media or Active Ingredient Chlorine Dioxide Hollow fiber Hollow Fiber Pleated glassfiber Hollow Fiber
Removes Bacteria? Yes Yes Yes Yes Yes
Removes Protozoa? (Cryptosporidium, Giardia) Yes Yes Yes Yes Yes
Removes Viruses'? Yes No No No No
Removes Chemicals? No No No No No
Removes Heavy Metals? No No No No No
Removes Particulates (sediment, microplastics)? No Yes Yes Yes Yes
Filter Pore Size N/A 0.2 microns 0.1 micron 0.2 microns 0.1 micron
Advertised Flow Rate N/A 1.75L/min 2.11 L per min 2 L/min 1.7L/min
Dimensions N/A 9.4 x 3 in 9.05 in x 2.73 in 10 x 6 x 2.4 in 11 x 6
Storage Capacity (L) 0 4 L 0.6 L 6 L 0
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