Platypus GravityWorks 4.0L
Platypus
4 L gravity filter for groups rated for 1,500 liters at 1.75 L a minute with no pumping.
Platypus GravityWorks 4.0L costs $134.95 in Cascade Designs's own US store, checked on October 6, 2026.
Where to buy in
Price in the maker's own store, checked October 6, 2026. Amazon prices change often, so we link without a price.
What you get
A hanging gravity system that filters 4 L without pumping. The maker rates it for 1,500 liters at 1.75 L a minute. It lists 99.9999% bacteria and 99.9% protozoa. Packed it is smaller than a 1 L bottle.
- Pump-free group filtration
- Packs smaller than a 1L bottle
Pros and cons of the Platypus GravityWorks 4.0L
Pros
- Pump-free filtering for a group at a rated 1.75 L a minute.
- Rated for 1,500 liters by the maker.
- Packs smaller than a 1 L bottle and weighs 11.5 oz.
Cons
- Bacteria and protozoa are listed but viruses are not.
- A hanging system needs somewhere to hang so it suits camp or home more than the road.
Specs
- Type
- gravity filter
- Filter lifemaker's rating
- 1,500 L
- Removes
- 99.9999% bacteria, 99.9% protozoa
- Capacity
- 4.0 L (6.0 L version $154.95)
- Tested to
- meets EPA & NSF guidelines (per maker)
- Weight
- 11.5 oz (326 g)
Why it scores 9.1
9.1/10
Shortlist score. How it is calculated
Emergency features
- Removes bacteria and protozoa
- Also removes or kills viruses
- Filter life or capacity listed by the maker
- Tested to a named standard
- Works without power
Tester picks
- Outdoor Life
- OutdoorGearLab
- The Prepared
Search demand
Number 11 of 20 on this shortlist for Google searches by model name.
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