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Platypus GravityWorks Water Filter System (4 L)

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About This Item

SPECS:

  • 8.0 L capacity (4.0 filtered + 4.0 unfiltered)
  • Material: polyethylene
  • Filters up to 1.75 liters per minute
  • Weight: 11.5 oz / 326 g
  • Dimensions: 3.25 in (W) x 9.5 n (L) / 8 cm (W) x 24 cm (L)
  • Filter cartridge life: 1,500 L

TECHNOLOGY:

  • Every microfilter is individually tested to ensure it meets all EPA & NSF guidelines for the removal of 99.9% of bacteria, particulates, and protozoa
  • Hollow fiber advantage: hundreds of tiny, hollow fibers enable the microfilter to filter water faster than traditional filter media

FEATURES:

  • Easily and quickly filters water for drinking, washing up, cooking, and cleaning
  • Light and compact - stows smaller than most 1 L bottles
  • No pumping - fill, hang, and let gravity do the filtering
  • Microfilter can be easily backflushed in 4 seconds to maintain filter performance
  • Includes clean reservoir (4.0 L), dirty reservoir (4.0 L), hollow fiber microfilter, hoses, shutoff clamp, and storage sack
  • Brand : Platypus
  • Web ID: 21PTYUGRVTYWRKS4LCAC
  • SKU: 15887723

REVIEWS

4.5
98%
Recommended

186 Reviews

Images

Never Pump Again!

We've had our 4L GravityWorks system for seven years now (still on the original filter!) and will never consider going back to a pump system. Our typical use is in the Boundary Waters and Ontario's Quetico Provincial Park on 10-day trips. On our last portage before our destination lake for the night we pull the dirty water reservoir out of the storage bag, paddle to the middle of the lake, scoop up four liters of water, then head for a campsite. Before setting up the tent, we hang the gravity filter and we have clean water before gear is in the tent! With proper backflushes, air purges, and cleaning/drying before storage, slow filtration has never been an issue. Only one problem: the black 'cleanside cap' disappeared on our recent Quetico trip. Where do I get a replacement? And shouldn't it be a brighter color?

Season 2: Disappointed

Used on first trip - year one, worked very well (filter was new)... year two the filter was nearly at a stand still. Not sure why the filter failed after one trip - it was backwashed and stored as per guidelines, and used in pretty clean water on the first trip. Expensive filter for a single use. Maybe go back to MSR pump filter? At least the MSR filter was reliable.

5 Trips To The Backcountry

I bought this 6 years ago for an annual canoe trip in Northern Ontario. It works great year after year, I always backflush it before putting it away and have never had any issues. During use it will need to be backflushed every 30 - 40 liters when I notice the flow is slowing down. At this point I've probably ran around 300 liters through it and it still works like the first day.

Fantastic!

I have used both the 4L and 6L for hiking groups with scouts in tropical Australia over the last 5 years. I went from the 4L to the 6L only because I accidently lost the 4L! :-( It has high usage with up to 10 people using it over 2-4 day hikes, 2-4 times a year. I follow the long term storage instructions and the filter cartridge has tested fine prior to use in the following season. Without detracting from the 5 star rating, my two gripes are this: 1. there should be another flow clamp on the dirty side of the filter for those occasions where 6L has been filtered but more water has been added to the dirty bag - this would allow flow to the filter to be stopped when the clean hose needs to be disconnected for use. As it seems the clamp cannot be purchased by itself (only part of a hose replacement kit), I have used a plastic clothes peg to crimp off the line as a solution. 2. the zip-lock on the top of the dirty bag can be incredibly hard to squeeze shut and it is even more difficult for youth who are trying to do it. Sometimes if it isn't quite done, when the bag is picked up, it will pop open. A fold over system with a slider to seal the top as can be found on 'Osprey' water bladders, or the top of a dry bag would be a far easier design option to use in the field. Overall, an amazing, functional system.

Filter Stopped Working

When I originally purchased the 4 liter filter I used it a total of maybe 3 times, always backflushing, and correctly storing it. Next season when I pulled my filter out it was already showing bubbles when doing an air push so filter is already broken. Went and bought a new filter which I used for the first time today and water doesn't come through. I soaked it and now it trickles like 1 liter in 10 minutes. I can't believe how fragile these filters are and how some people have been using them for years when I can't even get one to work once.

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