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Platypus GravityWorks Group Camping Water Filter System, 4-Liter

4.8 4.8 out of 5 stars 1,561 ratings

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Purchase options and add-ons

Material
Polyethylene
Capacity
4 Liters
Included Components
Clean reservoir, Dirty reservoir, microfilter, hoses, storage sack See more
Purification Method
Hollow Fiber Membrane

About this item

  • High-capacity, gravity-fed, hollow-fiber water filter system is ideal for group and family camping, outdoor adventures, and emergency preparedness
  • Meets all EPA/NSF guidelines for removal of 99.9999% of bacteria and 99.9% of protozoa, including giardia, cryptosporidium, E. coli, salmonella, cholera
  • No pumping required; reservoir fills easily and hangs from a tree to deliver four liters of filtered water for cooking and washing in 2.5 minutes
  • Includes 4-liter dirty water reservoir, 4-liter clean water reservoir, hollow-fiber microfilter, hoses, shutoff clamp, and storage sack
  • Replaceable cartridge filters up to 1,500 gallons; produces flow rate of 1.75 liters/minute; kit weights 11.5 ounces; made in the USA

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From the brand


From the manufacturer

Woman carrying two bags of water
Image detailing the use of a Platypus GravityWorks System
GravityWorks Features
Made in the USA
GravityWorks 4L GravityWorks Bottle Kit QuickDraw Comp Table AutoFLow XL
GravityWorks 4L System GravityWorks 2L Bottle Kit QuickDraw MicroFilter System AutoFlow XL 10L System
Customer Reviews
4.8 out of 5 stars
1,561
4.4 out of 5 stars
170
4.4 out of 5 stars
426
4.7 out of 5 stars
55
Which model is right for you? High-capacity system for filtering and dispensing water for groups Light, compact system that filters directly into any bottle or hydration reservoir. Ultralite and portable 1L system great for thru-hikers and fast-and-light missions Large yet light 10L system for group basecamps that filters directly into any water bottle
Flow Rate 1.75 liters per minute 1.75 liters per minute 3 liters per minute 1.75 liters per minute
Cartridge Type / Lifespan Hollow Fiber / 1500 Liters Hollow Fiber / 1500 Liters Hollow Fiber / 1000 Liters Hollow Fiber / 1500 Liters
Field Cleanable? Yes Yes Yes Yes
Weight 11.5 oz / 326 g 9.5 oz / 270 g 3.5 oz / 100 g 12 oz / 340 g

Product Description

The Platypus GravityWorks 4.0 Liter High-Capacity Water Filtration System is ideal for basecamps, group and family camping, outdoor activities, and emergency preparedness. It does not require pumps, batteries, moving parts, or chemicals, ensuring access to clean water from contaminated sources, in situations ranging from adventure to survival. The replaceable hollow-fiber microfilter cartridge filters up to 1,500 gallons of water, and meets all EPA and NSF guidelines for removal of 99.9999% of bacteria and 99.9% of protozoa, including Giardia, Cryptosporidium, E. coli, Salmonella, and Cholera. The water filtration system is easy to use almost anywhere. Simply scoop water from a lake, river, stream, or other contaminated water source into the 4.0-liter dirty water reservoir, and suspend above the 4.0-liter clean water reservoir. Water flows through the walls of the bundled fibers at rate of 1.75 liters/minute, leaving impurities behind, and filling the 4.0-liter clean water reservoir in just 2.5 minutes. It’s also easy to maintain in the field, backflushing in just four seconds to clean and restore performance. The Platypus GravityWorks 4.0 Liter High-Capacity Water Filtration System includes a 4-liter dirty water reservoir, 4-liter clean water reservoir, hollow-fiber microfilter, hoses, shutoff clamp, and storage sack. The complete kit is compact, packing down to the size of a one-liter water bottle, and weighs just 11.5 ounces. Made in the USA.

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Platypus GravityWorks Group Camping Water Filter System, 4-Liter


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Customer reviews

4.8 out of 5 stars
4.8 out of 5
1,561 global ratings

Customers say

Customers find the water filter easy to use and set up. They say it filters water much faster with no manual effort. They also appreciate the performance, saying it works flawlessly and quickly. Customers like that the filter is light weight. They mention that the materials are well made and durable.

AI-generated from the text of customer reviews

164 customers mention143 positive21 negative

Customers like the quality of the water filter. They mention that it filters water much faster than their older style filter, is well built, and easy to use. The filter timing is fast and the flow rate is impressively fast. Customers also say that the filtration system is amazing, efficient, and simple. They say it can filter just over a gallon in less than 10 minutes, making it the easiest way to purify water without the taste from tablets.

"This filtration system is amazing...." Read more

"...Cons:The filter is advanced but delicate, it cannot be dropped or used if the temperature may drop below 32F (0C) as it will damage the filter...." Read more

"Used product for a week long river trip. Easy to use filters water fast. Filtered water still tastes like river water...." Read more

"A very simple and efficient way to create a basecamp spigot and hydration bag refilling station (see image for details)...." Read more

156 customers mention153 positive3 negative

Customers find the Platypus system easy to use, simple, and efficient. They say it's convenient, takes hardly any time, and is easy to roll up. Customers also mention that the difference in effort is absolutely amazing.

"...Enough capacity for two people, light, effective, easy to set up. Durable and comes with all the bits and pieces...." Read more

"This filtration system is amazing. It's really simple to use, it filters 4 liters of water in just a few minutes..." Read more

"...It is SOOOOO easy to use. Dunk it in the stream and within a few minutes you have 4 liters of clean water...." Read more

"...All in all a great product. Simple to use. Would like it if the bag was just a bit larger...." Read more

141 customers mention130 positive11 negative

Customers are satisfied with the performance of the filter system. They mention that it works well, effortlessly, and efficiently. Some say that it has not given them a single issue. Customers also mention that the system works great for lakes, flowing rivers, and creeks, and that it's lightweight.

"...Enough capacity for two people, light, effective, easy to set up. Durable and comes with all the bits and pieces...." Read more

"This filter system works pretty darn good. I took it on a 3 night backpack trip on the Escalante River in Southern Utah with 6 people...." Read more

"I’ve used this system for years on canoe trips to BWCA. It works flawlessly and quickly. It packs down and weight is minimal...." Read more

"...it would be a nightmare pumping so much water... It worked perfectly for 5 days with daily flush...." Read more

97 customers mention93 positive4 negative

Customers like the weight of the water filter. They say it's light weight, easy to set up and use, and is lighter than most pump setups. The compact size makes it easy to carry and is worth the extra weight and size. The filter can filter water for two people and is comparable in size to a pump filter.

"...Enough capacity for two people, light, effective, easy to set up. Durable and comes with all the bits and pieces...." Read more

"...It's pretty easy to carry...." Read more

"...This weighs less than a pound at 13.6oz! This can also save you money in the long run...." Read more

"...It works flawlessly and quickly. It packs down and weight is minimal. I bring a backup uv purifier but have never needed it." Read more

81 customers mention67 positive14 negative

Customers like the quality of the water filtration system. They say it is easy to use, durable, and dependable. Customers also appreciate the well-made materials and the durable pumps. They mention that the system is well designed and a great solution for backpackers.

"...Durable and comes with all the bits and pieces. I added a charcoal for good measure.You won’t regret his purchase." Read more

"...a lot of water in one shot, it filters FAST, and most importantly... NO PUMPING! If you're backpacking this is a no brainer...." Read more

"...It seems well-made however. My 8 year old filled the bag and made the attachments for us...." Read more

"...The pumps are really really good (I have an older Katadyn pump), but they take some effort to use - and you'll get tired pumping water for a group..." Read more

53 customers mention47 positive6 negative

Customers find the cleaning process of the water filter to be easy and fast. They mention that the filter is easy to clean out if there is a clog, and the bags are fool proof to keep you from contaminating clean from dirty. Overall, most are satisfied with the ease of cleaning this product.

"...It can easily double the amount of clean water you have access to at your site...." Read more

"...It was easy to unclog though so not a big deal. I gave it 4 stars rather than 5 b/c I wouldn't trust it in less than pristine water...." Read more

"...Within a very short time you have clean, filtered water...." Read more

"...The river is pretty clean already, but it filtered stuff out for sure. It’s amazing how fast it goes too...." Read more

51 customers mention43 positive8 negative

Customers like the value of the water purifier. They say it's an excellent piece of equipment that works as advertised. They also say it makes a lot of good, clean water very quickly and easily. However, some customers feel the price is a little high, but well worth it. Overall, customers are satisfied with the value and quality of the product.

"...Yeah it's a little pricey, but well worth it. I would give it six stars if I could. Platypus has hit it out of the ball park with this." Read more

"...I couldn't believe it. And the real test comes with how pure and clean the filtered water was...." Read more

"...Just saving the extra trips to the stream or water is worth the money. It does take a little room in your pack, but everyone camping loved it" Read more

"...The added weight isnt significant and is totally worth it to save time and effort...." Read more

50 customers mention43 positive7 negative

Customers like the water capacity of the outdoor recreation product. They say it filters a lot of water in a short amount of time, providing plenty of water for cooking and drinking. They also say the 4 liter system is amazing and fast. Customers also mention that it's easy to fill water from a lake or stream.

"...It's really simple to use, it filters 4 liters of water in just a few minutes (you can see the water level drop while you watch it), and by..." Read more

"...What sold me on this is the fact that you can get a lot of water in one shot, it filters FAST, and most importantly... NO PUMPING!..." Read more

"...Overall a great product and easy to use. Filters quite enough water at a time too." Read more

"...Oh, and it's lighter than must pump setups with the added bonus of having two reservoirs...." Read more

Convert your GravityWorks into a Basecamp Spigot and Hydration Bag Refilling Station (see image)
5 Stars
Convert your GravityWorks into a Basecamp Spigot and Hydration Bag Refilling Station (see image)
A very simple and efficient way to create a basecamp spigot and hydration bag refilling station (see image for details). Just add a few inexpensive hydration tube quick-connect adapters to the clean filter line and to your backpack's hydration bag line and you're in good shape even for trekking/expeditions. But I would not bring this setup to a place where I did not know moderately clean water existed unless you a) want to clog your hallow-fiber filter and b) have a way of accessing very low or no-flow water sources (ultra-thin creeks or pooled water down below boulders/crags). For those applications, a hose and a pump are more reliable (I use Katadyn). But I always bring the GravityWorks when I know there's a reasonable water source.Tips: at twice the cost you can get quick-connect adapters that auto shut-off when disconnected. I wish I had purchased those but have learned to live with raising the tube above the bag's water height when necessary. I purchased two sets of the cheap one's made by Katadyn: Quickfill Hydration Pack Adaptor. Camelbak has one with a shutoff valve (decent work-around) and also sells the more expensive auto-shutoff variety.Also, I always backflush both before I begin filtering (per the instructional video by letting a little water filter into the clean bag then backflushing into the dirty while simultaneously removing air bubbles), but more importantly, I stop filtering before the last few ounces have left the dirty bag (always the dirtiest water) and backflush briefly onto the ground before disconnecting tubes and transporting everything back to camp. This second backflush takes seconds (just push down on the clean back after you disconnect the line from the dirty bag) and it visibly removes material that will would otherwise clog the filter. It sounds like a lot of work, but it's very easy once you get a routine down.About the complaints:1) The first few liters are going to taste like plastic. To solve this, fill both bags with clean water at home when you first purchase them and let them hang for a day or two. Rinse them both, then filter at least one full bag through the system. Shake the remaining water out of the filter, dry everything, and store.2) complaints about drying the "clean" bag are valid -- it takes a while, but I just blow up the bag, pull on it from the center of the flat part thereby forcing the bag into an open shape, and put it in a window for a few days.3) I too am not a fan of the dirty bag having no zip seal like the regular platypus hydration bags, but it's a trade off (weight savings). You can buy another bag with a seal if you really need that functionality, but who wants to spend unnecessary money. I recommend Platypus add a zip seal to future versions. It's just too often you don't have a tree handy so you're setting the dirty bag on top of a boulder, in which case an imperfect seal can cause water to start leaking (has happened to me many times). If you're religious about zipping the dirty bag very well, it will generally hold, but weakly, and if it's very cold outside (plus wet hands from filling the dirty bag), it can be hard to press that thick seal down along every inch of it (I play guitar and have strong hands, but freezing-cold water at 6:00am with wet fingers and wind-chill will weaken anyone's grip). A year ago I bought and promptly returned their larger reservoir bag (unrelated item to this system) because it had no zip seal mechanism and was worthless when setting a full bag on a counter top or boulder (one touch and that big zip would open up and dump water); another reviewer reported that reservoir dumping on his car seat, so it's clearly a valid concern. But overall these are minor complaints and I wouldn't change my setup over it. Most of the time you are hanging the dirty bag, or hiking with it empty and stored in your backpack. With a full clean bag, and a full backpack hydration bag, I could theoretically hike with 7 liters of water if necessary, and I even have another lightweight bag from MSR that could bring that total up to 13 liters if absolutely needed, so not using the dirty bag while filled when hiking is a non-issue for me.
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Top reviews from the United States

Reviewed in the United States on February 8, 2024
Reviewed in the United States on September 22, 2013
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Reviewed in the United States on September 21, 2015
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5.0 out of 5 stars BEST Water filter! Period.
Reviewed in the United States on September 21, 2015
Incredibly handy! Before buying this I did an exhaustive amount of research on water filters. What sold me on this is the fact that you can get a lot of water in one shot, it filters FAST, and most importantly... NO PUMPING! If you're backpacking this is a no brainer. Water weighs 8.3lb per gallon and an adult needs about a gallon a day, so bringing water on a multi-day trip is not an option. This weighs less than a pound at 13.6oz! This can also save you money in the long run. The filter lasts for 1500 liters or 396 Gallons, If you're buying gallons of water from the store that'll cost you $350-$400. Even if you're filling from the tap this will save space and save you from having to lug water around.

The other "straw" filters are handy, but if you need to fill a Camelbak bladder or use water for cooking, then you'll need a filter that is capable of filtering more water. The tubing and the storage bags are high quality and will not kink or deform. The hoses are long so you can hang the dirty bag from a branch and put the clean bag on the ground for maximum filtering speed, or you can just hang the clean bag from a lower branch. To dispense you can just detach the hose on the clean side of the filter and hang the clean bag as show in the picture.

Want to get the most out of one trip to the water source? You can actually get 8 liters in one shot! Just fill the dirty bag and wait a short 3 minutes for it to filter. Then detach the clean water bag from the hose and screw on the provided screw cap to close the clean bag. Then will up the dirty bag and boom you've got 4 liters ready to go and another 4 that can be quickly filtered! That's 2.1 Gallons in one trip!

Cleaning:
Every 8 liters or so (depending on water quality) when the dirty bag is nearly finished filtering, simply lift the clean bag higher and back-flush it for about 5 seconds and then clamp the hose and discard the water in the dirty bag. For long term cleaning add 2 liters of clean water to the dirty bag, add a couple drops of bleach, and filter it through. You can towel dry the dirty bag, but the clean bag you'll need to just hang it for a few days in a dry place. The filter can be dried out by removing the bumpers and the plastic end pieces, and leaving it sit for a week.

Cons:
The filter is advanced but delicate, it cannot be dropped or used if the temperature may drop below 32F (0C) as it will damage the filter. You can easily test the integrity of the filter though by trying to blow air backwards through it. If there are bubbles on the other side, then the filter is broken, if not then you are good.

I simply love this filter and couldn't be happier with my purchase. I hope you found this review helpful!
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Top reviews from other countries

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MadeleineAth
5.0 out of 5 stars Must have for camping trips!
Reviewed in Canada on October 30, 2023
Amazon Customer
5.0 out of 5 stars Excellent value for money - a 'must have' item for any adventurer. Light, reliable & easy to use.
Reviewed in the United Kingdom on May 8, 2019
Amazon Customer
5.0 out of 5 stars Wouldn’t hike without it
Reviewed in the United Kingdom on January 29, 2021
nygel smith
5.0 out of 5 stars Excellent product.
Reviewed in Canada on August 11, 2019
11 people found this helpful
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Karsten
5.0 out of 5 stars Vielen Dank!
Reviewed in Germany on December 5, 2017
2 people found this helpful
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