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Platypus GravityWorks

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PlatypusGravityWorks Water Filter System - 4 L
$134.95
30 reviews with an average rating of 3.8 out of 5 stars
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PlatypusGravityWorks/CleanStream Replacement Cartridge
$79.95
82 reviews with an average rating of 4.2 out of 5 stars
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Top Rated
PlatypusGravityWorks Water Filter System - 6 L
$154.95
10 reviews with an average rating of 4.5 out of 5 stars
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Related Expert Advice articles

Filter vs. Purifier

Filters: Remove protozoa (Cryptosporidium, Giardia) and bacteria (E. coli, Salmonella)—main concerns in the U.S. and Canada.
Purifiers: Also combat viruses such as hepatitis A, rotavirus and norovirus.

Filter Types

Straw: Light, easy to use. Only works at water source.
Bottle: Lightweight, quick, affordable. Water volume limited by bottle size.
Gravity: Easy to use, handles large quantities of water, has a replaceable element.
Pump: Precise, works in shallow water, has a replaceable filter. Bulky.
Ultraviolet light: Fast, no filter to replace. Requires batteries and prefiltering for cloudy water.
Squeeze: Compact and affordable. Water quantity limited by reservoir size.
Chemical: Inexpensive, ultralight backup method. Long wait time, doesn't taste great.