Simplicity is the name of the game with gravity filters. By inserting several varieties of filter cartridges, membranes, and mesh systems between a top and bottom reservoir, these devices let gravity do all the work, collecting pure, tasty water from bad tasting or contaminated sources.

We’ve been looking at the options for gravity water filters on the market at the moment. Here are the best gravity water filters available to buy right now:

Travel Berkey Gravity-Fed Water Filter with 2 Black Berkey Purification Elements
  • 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.
Survivor Filter PRO X Electric Water Filter
  • THE WORLD’S FIRST HANDHELD PORTABLE ELECTRIC SURVIVAL WATER FILTER - Introducing the World's First Portable Electric Water Filter that can Be Used with Any Plug, Mobile Charger or AA Batteries. Produces 17oz of Water Per Minute at the Touch of a Button. Tested to run on a set of High Energy AA Batteries for up to 12000oz of Filtered Water in Poor Conditions and 15000 in Ideal Conditions
  • SUPER CONVENIENT AND EASY TO USE - Simply tap the button and watch as it produces 17 ounces per minute of clean water, removing heavy metals, bacteria, parasites, and other nasty substances.
  • COMES WITH BACKWASHING SYRINGE SYSTEM - For easy cleaning in the wild of the membrane filters to 100,000+ liters. It's BPA free and comes with all internal filters and tubing, detachable drinking cup, travel bag, details instructions and how to use manual.
  • MULTIPLE WAYS TO POWER- the PRO X can run on 2 AA batteries and can be plugged into any 120-240 Volt power source connected through the included USB such as your home, a cigarette lighter or mobile battery pack
  • SURVIVOR FILTER LIFETIME WARRANTY - Survivor Filter is based in North America and we cover all manufacturing and other defects with our lifetime warranty. If you ever run into any problems with any of our products simply contact us and we will work to make it right.
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LifeStraw Flex Advanced Water Filter with Gravity Bag - Removes Lead, Bacteria, Parasites and Chemicals
  • 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

Why use a gravity water filter?

While most of us have access to clean and safe drinking water, there’s no guarantee that safe = great tasting. Chlorine from water treatment, trace substances from heavy industry, and naturally occurring mineral sediment can all give water an off-putting bitter or chemical flavor.

Gravity filters will do away with these annoying tastes, while also purifying your water of other potential contaminants such as heavy metals and bacteria (depending on the specific filtering mechanism).

Gravity systems are generally intended for either home or outdoor use. Camping gravity filters utilize lightweight components, such as plastic reservoir bags and tubing, which sit either side of a filtering component. The filter system is then suspended from a tree, tent pole, or car door, so that gravity can pull contaminated water from the upper reservoir down through the filter.

Home gravity water filters use the same principles with higher quality, more efficient materials. From stainless steel reservoirs with ceramic cartridges, to convenient carbon filter systems, all gravity water filters keep things simple and effective.

Sawyer Products SP160 One-Gallon Gravity Water Filtration System with Dual-Threaded Mini Filter, Blu/White/Clear
  • 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
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SimPure Gravity Water Filter Straw, Portable Water Purifier with 3L Gravity-Fed Bag, Outdoor Survival Gear for Camping Hiking and Emergency, BPA Free
  • ADVANCED FILTRTION SYSTEM: SimPure water filter straw made up 0.1 micron hollow fiber ultrafiltration membrane, 5 micron coconut shell GAC filter and 0.2 micron PP fiber filter, advanced filtration system to remove 99.99% heavy metal, chlorine, odors, organic harmful minerals etc, and make the water taste better.
  • FOOD GRADE MATERIAL: Our straw filter build out of strong food grade plastics, manufactured with FDA Certificated, BPA-Free ABS, very safe, with 3L BPA free large capacity TPU water storage bag can provide you with enough reliable source of pure drinking water at anytime and anywhere. Especially in an emergency.
  • LONG LIFESPAN: Our straw filter up to 5000 liters (1320gallons) of water purification, you can use it for a long time. Gravity-Fed portable water purifier, convenient carry handle, easy to use, just hang from the tree or other support to get pure water.Water filter lifespan can be extended by clean water backwashing.
  • CONVENIENT DESIGN: Come with an expansion interface for connection to a variety of beverage bottles for different people use and with an added extension tube which allows drinking rivers, ponds, streams or any water source directly. A a water stop valve to achieve ready-to-use water production, very convenient to use.
  • WHAT YOU GET: 1× water filter straw, 1×3L food grade TPU water storage bag, 1× food grade silicone tube, 1× expansion interface, 1× water stop valve, 1× carabiner. We provide one year warranty and 30 days money back, lifetime friendly customer service, if you have any questions, do not hesitate to contact us, we will always to stand help you.

What’s the filtering component inside a gravity water filter?

There are a few options here. Inside most gravity filters you’ll find a preliminary fiber mesh followed by an activated carbon filter. These elements work together to remove the most common contaminants found in drinking water. While the mesh will take care of any large sediment and particles, a carbon filter absorbs leftover chlorine and other chemical or pharmaceutical traces in your water supply.

Gravity filters at the pricer end of the spectrum may replace activated carbon with ceramic or silver cartridges. While operating in a similar way, these materials are able to filter a more extensive range of contaminants, including minerals, lead, and other heavy metals. (Ceramic cartridges can also be sanitized and reused).

Many gravity filters also incorporate a super-fine filtration membrane. Often known as Ultra, Nano, or Microfiltration, these membranes have tiny pores of only a few micrometers across, allowing them to catch protozoan cysts and other microorganisms. Such membranes are always found in gravity filters designed to be used on non-potable water, where insurance against waterborne diseases is a priority.

FAQs

Harnessing the force of gravity to let water naturally flow through a filter is a simple and cost-efficient method. It means filters don’t need to be connected to a power source, nor are they likely to contain any complex parts. It also makes gravity filters a great option for locations where water is questionable, but power is limited or nonexistent—so, the campsite, the cabin, or the RV.

However, relying on gravity means water treatment is restricted to filtration methods that operate at low water pressure. Using an outside force to push water through a filter module can result in more powerful filtration, as the pore size in membranes can be much smaller.

The membranes found inside a gravity water filter will often be labeled as providing ultrafiltration (UF), microfiltration (MF), or nanofiltration (NF). These terms refer to the size of the pores in a filter membrane, which determine what can fit through the filter, and therefore how powerful a filter can be considered to be.

Ultrafiltration is the most commonly sized membrane used in gravity filters because it works well under low water pressure, striking a good balance between power and efficiency. UF membranes lie between nano and micro membrane options, with a pore size that’s still small enough to remove cryptosporidium and giardia cysts.