This Product
Grayl Geopress
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Read the Review
Read the Review
Read the Review
Read the Review
Awards  Top Pick Award Best Buy Award Editors' Choice Award Top Pick Award 
Price $89.00 at Amazon
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$39.95 at Amazon$78.09 at Amazon
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$29.97 at Amazon
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$14.95 at REI
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Overall Score Sort Icon
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72
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Pros Super easy to use, fast filtration, durable design, amazing water qualityEasy to use, fast flow rate, collapsible, lightweightLightweight, great price, durable design, fast flow, high volume filtration, use for cold weatherLightweight, adaptable, easy to use, lifetime guaranteeLightweight, inexpensive, kills all pathogens (including crypto), reliable
Cons Bulky and heavier design, can't purify large quantities of water quickly, low cartridge lifespanLacks durability and reliabilityDoesn't filter out viruses, no additional storage reservoirNot great for group use, better if you replace the bagsTakes a long time to kill crypto, slight taste to the water, chemical treatment
Bottom Line A bottle purification system built to take on the dirtiest water sourcesA soft bottle filtration system designed for lightweight travelThe best value gravity filter on the marketThis lifetime guaranteed product is easy to use on the trailThe best chemical treatment option that will kill all pathogens when given enough time
Rating Categories Grayl Geopress Katadyn BeFree Katadyn Gravity Camp 6L Sawyer Squeeze Water Treatment Drops
Water Quality (20%)
10
8
8
8
5
Durability & Maintenance (20%)
5
1
7
5
10
Treatment Time (15%)
9
10
8
9
2
Weight & Packability (15%)
2
10
6
7
9
Ease Of Set Up (15%)
9
9
6
7
8
Ease Of Filtration (15%)
8
9
9
8
9
Specs Grayl Geopress Katadyn BeFree Katadyn Gravity... Sawyer Squeeze Water Treatment...
Type of Filter/Purifier Press-action Squeeze & on-the-go Gravity filter Squeeze, in-line, on-the-go Chemical treatment
Time to Treat One Liter (Timed Test) 18 seconds immediate 64 seconds 40 seconds Clear Water - 20 min
Turbid Water - 35 min
Measured Weight (entire kit -- oz) 19.4 oz 2.1 oz 11.7 oz 5.7 oz 3.0 oz
Total cost per 100 L ($) $36.00 $4.00 $6.00 $0.01 $13.16
Replacement cartridge cost per 100 L ($) $12.00 $2.50 $2.67 $0.01 $13.16
# of Liters (L)/gallons (gal) per lifetime 250 L/66 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 Ceramic, Activated Carbon 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? Yes No No No No
Removes Heavy Metals? Yes No No No No
Removes Particulates (sediment, microplastics)? Yes Yes Yes Yes No
Filter Pore Size N/A 0.1 micron 0.2 microns 0.1 micron N/A
Advertised Flow Rate 5/min 2.11 L per min 2 L/min 1.7L/min N/A
Dimensions 10.4 x 5.6 x 3.4 in 9.05 in x 2.73 in 10 x 6 x 2.4 in 11 x 6 N/A
Storage Capacity (L) 0.71 L 0.6 L 6 L 0 0
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