10 Best Gravity Water Filter of August 2025

• 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

Platypus

• Hollow fiber Membrane: 0.2 micron pore size. Removes 99.999999% of bacteria, 99.999% of protozoa, and 99.999% of Micro plastics
• Carbon fiber capsule: improves taste while reducing lead, other heavy metals, chlorine and Organic chemical matter (pesticides, herbicides, voc)
• Performance: exceeds US EPA drinking water standards for bacteria and parasites. Exceeds NSF 53 standard for reduction of lead and other heavy metals
• Longevity/lifetime: 2, 000 liters/500 gallons (hollow fiber Membrane) 100 liters/26.4 gallons (replaceable carbon capsule)
• Make an impact: for every Life Straw product purchased, a school child in need receives safe drinking water for an entire school year

LifeStraw

• Easily create gravity-based water filtering system with 0.1 micron absolute dual-threaded Sawyer MINI water filter and 1-gallon reservoir
• High-performance 0.1 Micron absolute inline filter fits in the palm of your hand and weighs just 2 ounces; 100% of MINI units individually tested three times to performance standards by Sawyer
• Dual-threaded MINI allows you to screw the push/pull cap onto the filter for easy on/off functionality; lightweight wide-mouth bladder for fast, easy filling; convenient carry handle
• Versatile water filter system is great for use as a camping water filter, backcountry treks, emergency prepping, and disaster kits
• Includes MINI Water Filter, 1-gallon bladder, cleaning plunger, cleaning coupling, and gravity hose with adapters; 100% of MINI units individually tested three times to performance standards by Sawyer

Sawyer Products

• 0.1 micron water filter removes harmful organisms like bacteria 99.9999% and protozoa like Giardia & Cryptosporidium 99.9%, surpassing EPA standards
• Collapsible 3.0L hydrapak soft bottle flask packs down small
• Ez-clean Membrane is simple and easy to clean by simply shaking or swishing the filter to clean debris, no backflushing or extra tools required
• Filters up to 1, 000 liters of contaminated water without using chemicals or other devices and hydrate quickly and easily with the free flow channels fast flow rate
• Made from durable BPA-free Thermoplastic Polyurethane

Katadyn

• 1.5 GALLON CAPACITY- The portable Travel Berkey Purification System effortlessly purifies water for about 1-3 people each day. The system is just 18” tall and 7.5” in diameter.
• POWERFUL PURIFICATION- Berkey systems equipped with Black Berkey Purification Elements purify water—not just filter it—by removing greater than 99.999% of viruses and greater than 99.9999% of pathogenic bacteria, while also removing or dramatically reducing protozoa (such as giardia and cryptosporidium), trihalomethanes, inorganic minerals, heavy metals (including arsenic, lead, mercury, chromium), pharmaceutical drugs (including caffeine, Acetaminophen, Ibuprofen, Progesterone, Triclosan),
• ECONOMICAL, LONG-LASTING- A pair of Black Berkey Purification Elements lasts for up to 6,000 gallons before needing replacement. Black Berkey Purification Elements average just 2 cents per gallon of purified water.
• INDEPENDENT TESTING- Berkey by NMCL uses several independent third-party labs to test a broad range of potential contaminants and conducts Extreme Testing for lead and PFCs in order to show the effectiveness of our Black Berkey Purification Elements.
• DRINK CONFIDENTLY VIRTUALLY ANYWHERE- No electricity, tools or plumbing required. Travel the world, prepare for emergencies, and take control of your family’s everyday drinking water with your Berkey gravity-fed water filtration system with Black Berkey purification elements. Enjoy delicious, nourishing water from the leader in gravity-fed water solutions.

Berkey

• 6 liter bag with water level indicator window
• 0.2 micron Ultra Flow Filter Technology has a flow rate up to 2L/min
• Provides up to 1,500 liters of safe drinking water against bacteria, protozoan cysts and sediment
• Quick-connect adaptor attaches directly to most hydration bladders
• Converts to shower with adaptor (sold separately)

Katadyn

• 2.25 GALLON CAPACITY- The portable Big Berkey Purification System effortlessly purifies water for about 1-4 people each day. Add additional Black Berkey Purification Elements (the Big Berkey System can hold a maximum of four) to increase the flow rate. The system is just 19.25” tall and 8.5” in diameter.
• POWERFUL PURIFICATION- Berkey systems equipped with Black Berkey Purification Elements purify water—not just filter it—by removing greater than 99.999% of viruses and greater than 99.9999% of pathogenic bacteria, while also removing or dramatically reducing protozoa (such as giardia and cryptosporidium), trihalomethanes, inorganic minerals, heavy metals (including arsenic, lead, mercury, chromium), pharmaceutical drugs (including caffeine, Acetaminophen, Ibuprofen, Progesterone, Triclosan),
• ECONOMICAL, LONG-LASTING- A pair of Black Berkey Purification Elements lasts for up to 6,000 gallons before needing replacement. Each additional pair of elements (sold separately) adds an additional 6,000 gallons of purification power to your system. Black Berkey Purification Elements average just 2 cents per gallon of purified water.
• INDEPENDENT TESTING- Berkey by NMCL uses several independent third-party labs to test a broad range of potential contaminants and conducts Extreme Testing for lead and PFCs in order to show the effectiveness of our Black Berkey Purification Elements.
• DRINK CONFIDENTLY VIRTUALLY ANYWHERE- No electricity, tools or plumbing required. Travel the world, prepare for emergencies, and take control of your family’s everyday drinking water with your Berkey gravity-fed water filtration system with Black Berkey purification elements. Enjoy delicious, nourishing water from the leader in gravity-fed water solutions.

Berkey

• 10 liter bag with water level indicator window
• 0.2 micron Ultra Flow Filter Technology has a flow rate up to 2L/min
• Provides up to 1,500 liters of safe drinking water against bacteria, protozoan cysts and sediment
• Quick-connect adaptor attaches directly to most hydration bladders
• Includes carrying strap

Katadyn

• 3.25 GALLON CAPACITY- The portable Royal Berkey Purification System effortlessly purifies water for about 2-4 people each day. Add additional Black Berkey Purification Elements (the Royal Berkey System can hold a maximum of 4) to increase the flow rate. The system is just 23” tall and 9” in diameter.
• POWERFUL PURIFICATION- Berkey systems equipped with Black Berkey Purification Elements purify water—not just filter it—by removing greater than 99.999% of viruses and greater than 99.9999% of pathogenic bacteria, while also removing or dramatically reducing protozoa (such as giardia and cryptosporidium), trihalomethanes, inorganic minerals, heavy metals (including arsenic, lead, mercury, chromium), pharmaceutical drugs (including caffeine, Acetaminophen, Ibuprofen, Progesterone, Triclosan),
• ECONOMICAL, LONG-LASTING- A pair of Black Berkey Purification Elements lasts for up to 6,000 gallons before needing replacement. Each additional pair of elements (sold separately) adds an additional 6,000 gallons of purification power to your system. Black Berkey Purification Elements average just 2 cents per gallon of purified water.
• INDEPENDENT TESTING- Berkey by NMCL uses several independent third-party labs to test a broad range of potential contaminants and conducts Extreme Testing for lead and PFCs in order to show the effectiveness of our Black Berkey Purification Elements.
• DRINK CONFIDENTLY VIRTUALLY ANYWHERE- No electricity, tools or plumbing required. Travel the world, prepare for emergencies, and take control of your family’s everyday drinking water with your Berkey gravity-fed water filtration system with Black Berkey purification elements. Enjoy delicious, nourishing water from the leader in gravity-fed water solutions.

Berkey

• Gravity-fed, high-capacity, hollow membrane water purifier; ideal for group and family camping, outdoor activities, and emergency preparedness
• Removes virtually all bacteria (99.9999%), protozoa (99.99%), and viruses (99.999%) that can contaminate water; easily fillable in lakes and streams
• Compact roll-bag reservoir available in 5-liter (1.3 gallon) or 12-liter (3.1 gallon) size; can be suspended from tree or other support for easy access
• Simple to use and maintain, without chemicals, batteries, or moving parts; features carrying strap and includes stuff sack for storage and portability
• Lifetime filtration capacity of 18,000 liters (4,755 gallons); produces flow-rate of 9-12 liters (2.4-3.4 gallons) of purified water per hour

LifeStraw