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GravityWorks™ 4.0L Water Filter System

High-capacity, pump-free water filtration for groups and basecamps. Learn more.

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Description
Tech Specs
Videos
FAQs & Documents

GravityWorks™ 4.0L Water Filter System


Filtering up to 1.75 liters a minute without any pumping, the high-capacity GravityWorks 4.0L water filter is one of the easiest and fastest ways to get filtered water in the backcountry. Ideal for bigger backpacking groups or basecamps, the system has an 8 liter total capacity, easily supplying filtered water for drinking, washing up, cooking, and cleaning.
  • No pumping: Just fill the dirty reservoir, hang it, and let gravity do the hard work—yep, filtering water can be as easy as fill, hang, relax.
  • Fast: Filters up to 1.75 liters per minute; microfilter lifetime up to 1,500 liters of water.
  • Effective: Every microfilter is individually tested to ensure it meets all EPA & NSF guidelines for the removal of 99.9999% of bacteria and 99.9% of protozoa*.
  • Light & Compact: System weighs 11.5 oz. (326 g) and stows smaller than most 1L bottles.
  • Group-ready: 8 liter (4.0L filtered + 4.0L unfiltered) total capacity easily supplies water for groups.
  • Field-cleanable: Microfilter can be easily backflushed in 4 seconds to maintain filter performance.
  • Hollow Fiber Advantage: Hundreds of tiny, hollow fibers, enable the microfilter to filter water faster than traditional filter media.
  • Easy collecting & dispensing: Collecting water is easy—simply open the top, scoop water, and close; control delivery of filtered water with hose shutoff clamp.

Comes with: 4.0L Clean reservoir, 4.0L Dirty reservoir, Hollow Fiber microfilter, hoses, shutoff clamp, and storage sack.

*This includes Giardia, Cryptosporidium, E. coli, Salmonella and Cholera.

Award Image
Award Image
Weight (Standard) 11.5 oz Weight (Metric) 0.33 kg
Width (Standard) 3.25 in Width (Metric) 8 cm
Length (Standard) 9.5 in Length (Metric) 24 cm
Effective against bacteria Yes Effective against particulate Yes
Effective against protozoa Yes Filter media Hollow Fiber
Filter pore size (microns) 0.2 Flow (L/min) 1.75 liters per min
Cartridge life 1500 liters Field cleanable Yes
Country of Origin Made in U.S.A. of U.S. and Imported Materials

Platy™ How To: Care and Maintenance of your Platypus™ GravityWorks™ Water Filter

Documents and Instructions

Backflushing regularly maintains optimal performance of the filter cartridge. This is especially true when filtering murky or very silty water. Backflushing rinses out particulate that collects on the outside of the Hollow Fiber filter media. Infrequent backflushing makes it more difficult to restore the filter’s flow rate.

Based on results from our in-house water lab, we recommend backflushing anywhere from every 8 liters to as often as after each use, depending on water quality. Our lab has found that the more you backflush, you can expect better maintenance of flow performance and longer life from your filter cartridge.

This color of water typically comes from a high concentration of decaying vegetation adjacent to, or in, a water source, resulting in a variety of organic acids. These acids, and the accompanying water conditions, are very hard on ALL types of water filters. Get your water elsewhere if you can.

However, if no alternatives exist, we recommend backflushing/cleaning your filter after every use in the field. This will help minimize the impact of these impurities.

Then, when you return home, add 2 drops of unscented household bleach to one liter of water and backflush this solution through the filter. This will help break up organics that might be clogging the filter and prepare your system for long-term storage.

Note: extended use of tea-colored water can permanently impair Hollow Fiber filter media.

Once you have used your GravityWorks™ filter and wet the Hollow Fiber filter media, the fibers will still be wet. Therefore, it is important to prevent it from freezing, which can permanently damage the filter media. If you are traveling in areas where you are expecting freezing or near freezing temperatures, bring the filter into your tent, or even your sleeping bag. (Be sure to put the filter in a water tight bag to prevent leaks in your sleeping bag.) If you think your filter may have been damaged by freezing, perform a Filter Test before the next use.

For expedition-style travel where freezing temperatures are the norm, we recommend using the MSR® MiniWorks® filter. Its ceramic/carbon filtration media is better suited to such conditions.

We don’t recommend removing the protective bumpers (GravityWorks) or removing the Filter Cartridge from the protective housing (CleanStream). The bumpers on the GravityWorks™ filter are designed to protect the Filter Cartridge from most drops, but direct drops onto cement and any drops above 5 feet (1.5m) should be avoided. If the Filter Cartridge itself is ever dropped after being wetted and outside the protective housing, you should replace it. If you think your filter may have been damaged from a drop, perform a Filter Test before the next use.

Yes. Simply remove the bite valve on your hydration system and connect the end of the hose directly to your filtration system’s outflow port. Using a GravityWorks™ filter system, your reservoir can take the place of the supplied Clean reservoir, creating what is arguably the lightest, most compact and efficient way possible to get water. GravityWorks™ filters are available with direct-to-reservoir and direct-to-bottle adapters for optimum versatility.

E-mail: Cascade Designs Service Center
Tel: 1-800-531-953

For customers outside North America, please consult our International Distributor listings.

No. Hollow Fiber filter media does not remove tastes from water.

However, the use or addition of an additional filter with carbon activated technology will absorb most of the unwanted tastes you may find in filtered backcountry water. For our GravityWorks systems, our Carbon Element accessory is available for those that prefer cleaner-tasting filtered water.

To disinfect your Platypus filtration system, fill it with a solution of unscented household bleach and water, using a concentration of 2-5 drops per liter of water. Close and swirl for 10 seconds. Leave filled overnight.

Filter solution through any filters and/or hoses, then rinse system (including filters and hoses) three times with hot water. Let air dry.

Note: for an eco-friendlier option, use a chlorine-free, hydrogen peroxide-based bleach alternative.

Cleaning regularly maintains optimal performance of the filter cartridge. This is especially true when filtering murky or very silty water. Cleaning dislodges particulate that collects on the outside of the Hollow Fiber filter media. Infrequent cleaning makes it more difficult to restore the filter’s flow rate.

Based on results from our in-house water lab, we recommend cleaning anywhere from every 8 liters to as often as after each use, depending on water quality. Our lab has found that the more you clean a filter, you can expect better maintenance of flow performance and longer life from your filter.

A used GravityWorks™ or Meta™ Bottle filter will have wet Hollow Fiber filter media, which can freeze and break the fibers of the filter media (permanently damaging the filter). Therefore, it is important to prevent Hollow Fiber filters from freezing.

If you are traveling in areas where you are expecting freezing or near-freezing temperatures, we recommend carrying or stowing the filter cartridge near your body (e.g., in a chest pocket) and bringing the filter cartridge with you into your tent, or even your sleeping bag. (Be sure to put the filter cartridge in a watertight bag to prevent leaks.)

If you think your filter may have been damaged by freezing, perform a filter integrity test before the next use (see instructions for your filter product). We recommend carrying a replacement filter as a backup in case of a failed integrity test.

Hollow Fiber filters can be sensitive to hard drops. Any drops from heights over 5 feet (1.5 m) and direct drops onto cement or rocks should be avoided with GravityWorks™ and Meta™ Bottle filters.

If you think your filter may have been damaged from a drop, perform a filter integrity test before the next use (see instructions for your filter product). We recommend carrying a replacement filter as a backup in case of a failed integrity test.

Note: do not remove the protective bumpers on the GravityWorks filters.

Yes. Simply remove the bite valve on your hydration system and connect the end of the hose directly to your filtration system’s outflow port.

Our GravityWorks™ filters are available with direct-to-reservoir and direct-to-bottle adapters for optimum versatility. Connecting a GravityWorks filter to your reservoir creates what is arguably the lightest, most compact and efficient way to get filtered water.

Yes. Periodically adding a little Vaseline to the tracks will keep them supple and easy to close. Wipe away any excess Vaseline. In the field, a little lip balm or water can do the trick.

Many replacement parts can be purchased directly from us online on our Accessories page or from one our retailers. If you cannot find what you’re looking for, our friendly customer service team can assist you:


For customers outside North America, please consult our International Distributor listings.

No. All Platypus hydration products are 100% BPA-, BPS- and phthalate-free, and do not use polycarbonate.

Description

GravityWorks™ 4.0L Water Filter System


Filtering up to 1.75 liters a minute without any pumping, the high-capacity GravityWorks 4.0L water filter is one of the easiest and fastest ways to get filtered water in the backcountry. Ideal for bigger backpacking groups or basecamps, the system has an 8 liter total capacity, easily supplying filtered water for drinking, washing up, cooking, and cleaning.
  • No pumping: Just fill the dirty reservoir, hang it, and let gravity do the hard work—yep, filtering water can be as easy as fill, hang, relax.
  • Fast: Filters up to 1.75 liters per minute; microfilter lifetime up to 1,500 liters of water.
  • Effective: Every microfilter is individually tested to ensure it meets all EPA & NSF guidelines for the removal of 99.9999% of bacteria and 99.9% of protozoa*.
  • Light & Compact: System weighs 11.5 oz. (326 g) and stows smaller than most 1L bottles.
  • Group-ready: 8 liter (4.0L filtered + 4.0L unfiltered) total capacity easily supplies water for groups.
  • Field-cleanable: Microfilter can be easily backflushed in 4 seconds to maintain filter performance.
  • Hollow Fiber Advantage: Hundreds of tiny, hollow fibers, enable the microfilter to filter water faster than traditional filter media.
  • Easy collecting & dispensing: Collecting water is easy—simply open the top, scoop water, and close; control delivery of filtered water with hose shutoff clamp.

Comes with: 4.0L Clean reservoir, 4.0L Dirty reservoir, Hollow Fiber microfilter, hoses, shutoff clamp, and storage sack.

*This includes Giardia, Cryptosporidium, E. coli, Salmonella and Cholera.

Award Image
Award Image
Made in U.S.A. of U.S. and Imported Materials
Tech Specs
Weight (Standard) 11.5 oz Weight (Metric) 0.33 kg
Width (Standard) 3.25 in Width (Metric) 8 cm
Length (Standard) 9.5 in Length (Metric) 24 cm
Effective against bacteria Yes Effective against particulate Yes
Effective against protozoa Yes Filter media Hollow Fiber
Filter pore size (microns) 0.2 Flow (L/min) 1.75 liters per min
Cartridge life 1500 liters Field cleanable Yes
Country of Origin Made in U.S.A. of U.S. and Imported Materials
Videos

Platy™ How To: Care and Maintenance of your Platypus™ GravityWorks™ Water Filter

FAQs & Documents

Documents and Instructions

Backflushing regularly maintains optimal performance of the filter cartridge. This is especially true when filtering murky or very silty water. Backflushing rinses out particulate that collects on the outside of the Hollow Fiber filter media. Infrequent backflushing makes it more difficult to restore the filter’s flow rate.

Based on results from our in-house water lab, we recommend backflushing anywhere from every 8 liters to as often as after each use, depending on water quality. Our lab has found that the more you backflush, you can expect better maintenance of flow performance and longer life from your filter cartridge.

This color of water typically comes from a high concentration of decaying vegetation adjacent to, or in, a water source, resulting in a variety of organic acids. These acids, and the accompanying water conditions, are very hard on ALL types of water filters. Get your water elsewhere if you can.

However, if no alternatives exist, we recommend backflushing/cleaning your filter after every use in the field. This will help minimize the impact of these impurities.

Then, when you return home, add 2 drops of unscented household bleach to one liter of water and backflush this solution through the filter. This will help break up organics that might be clogging the filter and prepare your system for long-term storage.

Note: extended use of tea-colored water can permanently impair Hollow Fiber filter media.

Once you have used your GravityWorks™ filter and wet the Hollow Fiber filter media, the fibers will still be wet. Therefore, it is important to prevent it from freezing, which can permanently damage the filter media. If you are traveling in areas where you are expecting freezing or near freezing temperatures, bring the filter into your tent, or even your sleeping bag. (Be sure to put the filter in a water tight bag to prevent leaks in your sleeping bag.) If you think your filter may have been damaged by freezing, perform a Filter Test before the next use.

For expedition-style travel where freezing temperatures are the norm, we recommend using the MSR® MiniWorks® filter. Its ceramic/carbon filtration media is better suited to such conditions.

We don’t recommend removing the protective bumpers (GravityWorks) or removing the Filter Cartridge from the protective housing (CleanStream). The bumpers on the GravityWorks™ filter are designed to protect the Filter Cartridge from most drops, but direct drops onto cement and any drops above 5 feet (1.5m) should be avoided. If the Filter Cartridge itself is ever dropped after being wetted and outside the protective housing, you should replace it. If you think your filter may have been damaged from a drop, perform a Filter Test before the next use.

Yes. Simply remove the bite valve on your hydration system and connect the end of the hose directly to your filtration system’s outflow port. Using a GravityWorks™ filter system, your reservoir can take the place of the supplied Clean reservoir, creating what is arguably the lightest, most compact and efficient way possible to get water. GravityWorks™ filters are available with direct-to-reservoir and direct-to-bottle adapters for optimum versatility.

E-mail: Cascade Designs Service Center
Tel: 1-800-531-953

For customers outside North America, please consult our International Distributor listings.

No. Hollow Fiber filter media does not remove tastes from water.

However, the use or addition of an additional filter with carbon activated technology will absorb most of the unwanted tastes you may find in filtered backcountry water. For our GravityWorks systems, our Carbon Element accessory is available for those that prefer cleaner-tasting filtered water.

To disinfect your Platypus filtration system, fill it with a solution of unscented household bleach and water, using a concentration of 2-5 drops per liter of water. Close and swirl for 10 seconds. Leave filled overnight.

Filter solution through any filters and/or hoses, then rinse system (including filters and hoses) three times with hot water. Let air dry.

Note: for an eco-friendlier option, use a chlorine-free, hydrogen peroxide-based bleach alternative.

Cleaning regularly maintains optimal performance of the filter cartridge. This is especially true when filtering murky or very silty water. Cleaning dislodges particulate that collects on the outside of the Hollow Fiber filter media. Infrequent cleaning makes it more difficult to restore the filter’s flow rate.

Based on results from our in-house water lab, we recommend cleaning anywhere from every 8 liters to as often as after each use, depending on water quality. Our lab has found that the more you clean a filter, you can expect better maintenance of flow performance and longer life from your filter.

A used GravityWorks™ or Meta™ Bottle filter will have wet Hollow Fiber filter media, which can freeze and break the fibers of the filter media (permanently damaging the filter). Therefore, it is important to prevent Hollow Fiber filters from freezing.

If you are traveling in areas where you are expecting freezing or near-freezing temperatures, we recommend carrying or stowing the filter cartridge near your body (e.g., in a chest pocket) and bringing the filter cartridge with you into your tent, or even your sleeping bag. (Be sure to put the filter cartridge in a watertight bag to prevent leaks.)

If you think your filter may have been damaged by freezing, perform a filter integrity test before the next use (see instructions for your filter product). We recommend carrying a replacement filter as a backup in case of a failed integrity test.

Hollow Fiber filters can be sensitive to hard drops. Any drops from heights over 5 feet (1.5 m) and direct drops onto cement or rocks should be avoided with GravityWorks™ and Meta™ Bottle filters.

If you think your filter may have been damaged from a drop, perform a filter integrity test before the next use (see instructions for your filter product). We recommend carrying a replacement filter as a backup in case of a failed integrity test.

Note: do not remove the protective bumpers on the GravityWorks filters.

Yes. Simply remove the bite valve on your hydration system and connect the end of the hose directly to your filtration system’s outflow port.

Our GravityWorks™ filters are available with direct-to-reservoir and direct-to-bottle adapters for optimum versatility. Connecting a GravityWorks filter to your reservoir creates what is arguably the lightest, most compact and efficient way to get filtered water.

Yes. Periodically adding a little Vaseline to the tracks will keep them supple and easy to close. Wipe away any excess Vaseline. In the field, a little lip balm or water can do the trick.

Many replacement parts can be purchased directly from us online on our Accessories page or from one our retailers. If you cannot find what you’re looking for, our friendly customer service team can assist you:


For customers outside North America, please consult our International Distributor listings.

No. All Platypus hydration products are 100% BPA-, BPS- and phthalate-free, and do not use polycarbonate.

size chart