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Platypus GravityWorks 4L Review

Platypus GravityWorks 4L
Brand and Model Platypus GravityWorks 4L
Pros Easy to use, fast
Cons Not an excellent choice for thru-hiker
Best Uses Day Hiking, General Outdoor

1Platypus GravityWorks 4L Overview

The Platypus GravityWorks Water Filter System includes all of the components needed – water filter, hosing, quick-connectors, valve and two 4 liter hydration reservoirs – to use gravity as water filter system.

It’s easy to use, fast, versatile, effortless and time saver. In fact, the Platypus GravityWorks lasts a long time before replacement, besides it filters large amounts of water with few sacrifices. So, the GravityWorks is a best choice as a gravity filer system regardless the larger packed size and weight.


The Platypus GravityWorks filter is effective against particles, protozoa and bacteria, but not viruses. As a result, it is perfect for North America backcountries where Giardia is the main issue, but it may be not elsewhere.


The Platypus GravityWorks System is incredibly simple and easy to use; you fill the dirty bag, zip the top, connect the hose to the filter pointing towards the clean bag, hang the dirty bag from a branch and the clean bag on the ground and it is working.

The main issue with this system the zip; it can be strongly difficult to zip shut, especially on cold weather.

4Treatment Capacity

The Platypus GravityWorks Water Filter System is a perfect option for hiking groups who need to treat a large quantity of water in a few times, for camp cooking and in dry areas where water could be a little sketchy or hard to find. In fact, this system can store up to 4 liters of clean water, so it is an important amount of liquid.


The GravityWorks System filter water quickly and cleanly, it can filter up to four liters of dirty water within five minutes, better than hand pump which takes 6 minutes to purify the same quantity.

6Weight and Packability

At over 11 ounces, the GravityWorks System is heavier than some of the ultralight water filters, like Sawyer Mini, but the convenience is to not pump or squeeze the water through the filter.

In terms of packability, the bladders roll into themselves and the filter itself is small, so the packability is not a challenge.

7Durability and Maintenance

Platypus use flavor-free thin plastic bags with stronger closures. Besides the shutoff clamp is very convenient, but the hollow fiber membrane filters are susceptible to disrupt in cold weather, so make sure to insulate them.

The maintenance on GravityWorks System is very low and the hollow fiber filter needs to be replaced just after 1500L.

8Pros and Cons


  • Easy to use
  • Fast treatment time

  • Not an excellent choice for thru-hiker
  • Hard to collect water from small sources


  • Weight: 11.5 oz.
  • Width: 3 inches
  • Height: 9.5 inches
  • Filter Pore Size: 0.2 microns
  • Cartridge Life: 1500 Liters
  • Filter Media: Hollow Fiber
  • Flow Rate: 1.75 L/minute
  • Effective against Protozoa, Bacteria and Particulates
  • Ineffective against Chemicals/Toxins, Viruses
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