Platypus GravityWorks 4.0 Liter High-Capacity Water Filter System for Group Camping and Emergency Preparedness
- 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
Frequently bought together
Customers who viewed this item also viewed
Have a question?
Find answers in product info, Q&As, reviews
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.
From the manufacturer
Hollow Fiber Technology
GravityWorks filters are made of hundreds of hollow fibers bundled into a single filter. Water flows through the walls of these fibers, leaving impurities behind. The resulting filter provides up to 18 times more surface area than traditional filter media.
Platypus Gravity Works
Platypus GravityWorks water filters make it effortless to get clean water practically anywhere. You simply fill the reservoir and let gravity filter the water for you. GravityWorks filters provide clean water faster than most pump systems, and they make it easier to store, transport and dispense all the water you need. All GravityWorks filters meet EPA & NSF guidelines for the removal of Bacteria and Protozoa, including Giardia, Cryptosporidium, E.coli, Salmonella and Cholera.
- Collect water anywhere
- Gravity does all the work
- Produces 1.75L of clean water per minute
- Antimicrobial, taste- and BPA-free
|Gravity Works 4L System||Gravity Works 2L Bottle Kit||Gravity Works 2L System|
|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.||All the versatility of the Bottle Kit with the addition of a 2L Platy Bottle.|
|Flow (L/min):||1.75 liters per minute||1.75 liters per minute||1.75 liters per minute|
|Cartridge Media / Life:||Hollow Fiber / 1500 liters||Hollow Fiber / 1500 liters||Hollow Fiber / 1500 liters|
|Field cleanable?||Yes - backflush for 4 seconds||Yes - backflush for 4 seconds||Yes - backflush for 4 seconds|
|Weight:||11.5 oz / 326 g||9.5 oz / 270 g||11.5 oz / 325 g|
|Width:||3.25 in / 8 cm||3 in / 8 cm||3 in / 8 cm|
|Length:||9.5 in / 24 cm||9 in / 23 cm||9 in / 23 cm|
Other great accessories for the Gravity Works:
GravityWorks Carbon Element
Maximize the Platypus taste-free experience with the new GravityWorks Carbon Element. It easily splices in after the GravityWorks hollow fiber element with an included hose segment, helping to remove flavors, odors, and many organic compounds from filtered water for the best taste possible. (sold separately)
GravityWorks Filter Cartridge
Effective down to .2 microns and meets EPA Guide Standards for the removal of bacteria and protozoa. Approximate filter life of 1500L depending on quality of water filtered. (sold separately)
Universal Bottle Adapter
The Universal Bottle Adapter allows any GravityWorks water filtration system to filter directly into a wide range of hard bottles and hydration systems, eliminating the weight of a dedicated Clean Reservoir. Its multi-component design lets you take just the parts you need for your vessel of choice to further lighten your load. (sold separately)
Replacement Hose Kits
Kits for both the 4.0L and 2.0L GravityWorks systems contain Clean and Dirty hoses, as well as a replacement Quick-Connect fitting and shutoff clamp. (sold separately)
We believe in clean water
Our mission is to create the finest reservoirs and water filters on the planet so you're never without clean water. That's why we put thousands of hours of laboratory testing and field use behind every piece of gear we sell. The result is clean and taste-free hydration you can count on day after day, anywhere in the world.
Showing 1-4 of 4 reviews
There was a problem filtering reviews right now. Please try again later.
Most helpful customer reviews on Amazon.com
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!
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.
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!
update: just called support that were very nice and will send me a replacement bag, since it should have been a manufacturing problem...
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.
As the other Amazon reviews state- the use is almost effortless- fill the dirty bag- hang it up somewhere- you can hold it if there isnt anywhere to hang it- the whole 4 liters filters in a few minutes so if you are holding the bag you wont be doing it long.
The filter is light weight and pretty compact considering the ease and speed of the filtering. I have taken it out on several trips since I bought it and after people see how easy and quick it is to get clean water from the GravityWorks they put away their filters and ask to use mine.
One note on use- after you filter the 4 liters of water through you should switch bag positions and allow one liter of clean water to flow back through the filter into the dirty bag. Then dump out the liter in the dirty bag. This process will ensure that your filter flow will remain quick even after 100's of liters of filtering. It helps purge the filter of and large particles.