The 8 Best Gravity purifiers (2023 reviews)

The waterdrop emergency preparedness is specially designed for your daily purpose and has plenty of most useful features. The waterdrop filter straw can provide safe drinking water up to 1, 400 gallons ( 5, 300 liters) and ensures the maximum water flow rate of up to 700 ml / min to provide more relaxed outdoor water drinking experience. It comes with 3 personal water filters (waterdrop brand), each individually wrapped and sealed. It comes with a water bag which is a plus but can also attach to most plastic bottles.

The gravity fill bag also has excellent construction being easy to fill and with a self-sealing valve. It improves odor and taste, ensures the water safety and delivers better drinking experience. It comes with an innovative backwash purifier function, the inside of the water filter straw can be kept clean at all times and it is recyclable, safe and pollution-free. The bag is amazing just for collecting water and hanging the bag close to your site so you can fill the bag then drain into a cup or bowl and drink with the straw.

Why We Like This:

Great water straw for the hiking/camping pack
Easy to pack away for emergency use
Good gift for the outdoorsman and survivalists
Good, affordable filter for small scale, portable filtering of clear water

Best For An Emergency Replacement: Membrane Solutions Gravity Purifier

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The membrane solutions gravity purifier's superior materials makes sure that it ages well with use. The material of the gravity bag is heavy-duty premium TPU, it is very durable for reusing, not easy to tear apart. It can filter approximately 1.59 gallons of water at one time. It holds 6 liters in total, nearly 2 gallons of water at one time. It has plenty of strap to hang the bag and the water filter house is long enough as well. The gravity feed is nice since you can load the entire bag and use it throughout the night. It's very light, perfect for backpacking/survival.

The bag does not have a water tight seal on top.

Why We Like This:

Holds plenty of water taste great crystal clear
Makes good addition to camping gear, hiking gear, car kit, home emergency kit, etc
Priced well and it is made from a durable material

Best For larger groups: Lifestraw Great Product

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The lifestraw great product is capable of outshining several other purifier featured in this list in overall features for the price point. The Berkey Filters and Zero Water have been independently lab tested to do a great job of filtering out dissolved solids and chemical contaminants, but neither one has a very large quantity of activated carbon. This is the large 12/Litre/3 gallon group model, which would provide clean fresh water for a whole family or a patrol of scouts. The LifeStraw is an amazingly simple, lightweight, and effective solution that requires no power, and can be deployed anywhere.

There is a nylon storage bag inside the big blue bag along with four extra pre-filters and a carrying/hanging strap. The hose is included that could easily allow for this dirty water to be easily directed away from the clean water supply. This system is perfect for multi-day trips. The LifeStraw is easier to carry and use, drink right from the cup with the straw, no set up or waiting. The bladder can be cleaned with water and a mild detergent.

Why We Like This:

Has an easy to clean prefilter and purification cartridge
A real life saver for emergencies or for camping/backpacking
Light weight and ease of operation
You can use with tap water and it works as good as boiling

Best For larger group Of hikers: Lifestraw Gravity Purifier

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The lifestraw gravity purifier is suitable and reliable and fits well with your daily usage. It is perfect for a home emergency kit. It allows access to clean, safe drinking water in the event of a natural disaster or survival situation. The mission water purification system removes viruses in addition to bacteria, parasites and microplastics from the water. These are lightweight, sturdy, and can condense down into a small package for portability.

It features a carrying strap and includes a sack for storage and portability. The whole thing feels very durable and packs up neatly for camping and hiking trips. It is easy to use water filter for campers, for emergencies or remote homesteaders. This comes with a blue nylon storage bag.

Why We Like This:

Simple to use and maintain, without chemicals, batteries, or moving parts
Ideal for group and family camping, outdoor activities, and emergency preparedness
Makes for a perfect camping companion or addition to an emergency prep bag
Attaches to the roll bag for carrying the heavy 'filled' bag

Best With Gravity Bag: Waterdrop Gravity Purifier

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Waterdrop makes beautiful and great purifier with classic and smartly choosen materials. The Waterdrop gravity water filter straw with 1.5 gal gravity-fed water bag is an exclusive water purification combination created for outdoor activities and first aid survival. It includes a 1.5-gallon gravity bag, 2 filterstraws and 2 collapsable pouches. It improves odor and taste, ensures the water safety and delivers better drinking experience. The capacity water bag can hold up to 15 gallons of water at a time, which is about 11 bottles of 500 ml bottled purified water, and can meet all. It comes with innovative backwash purifier function, and the inside of the water filter straw can be kept clean at all times and it is recyclable, safe and pollution-free.

The waterdrop filter straw can provide safe drinking water up to 1, 400 gallons ( 5, 300 liters)/ one straw, and ensures the maximum water flow rate of up to 700 ml / min to provide more relaxed outdoor water drinking experience.

Why We Like This:

Fulfill all your outdoor water demands
Match with water bags or bottles for the ultimate drinking experience
Plenty of capacity for holding water for camping etc

Best For international Travel: joypur Gravity Purifier

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If you often find yourself confused about appropriate and satisfactory purifier, joypur gravity purifier is your end point. It provides you with clean, safe drinking water.Ensures the water safety and delivers better drinking experience.

Why We Like This:

Fulfill all your outdoor water demands
Lot of satisfied buyers

Best With bladder: Shurex Gravity Purifier

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Not everyone likes to purchase purifier for their daily usage, but the shurex gravity purifier would be an anomoly. This gravity water filtration system just offers you another layer of protection. It comes with 3 gallons of large capacity, and the gravity-fed bag can meet a family's or a group's water needs during your outdoor activities. It is made of hollow fiber membrane filter pore size. It can filter 100, 000 gallons of water, and the bag and strap look commercial grade. The fitting on the filter that the hose fits over has no retention mechanism beyond a friction fit.

This filter also has a small carbon filter that can improve the taste of water, and may remove some organic chemicals or heavy metals. The filter allows you to have clean water whether or not you collect water in the durable strong bag, or if you need to drink from a river real quick bc your water bottle is empty. They also use a non-woven fabric so you can have the cleanest water available.

Why We Like This:

Fed water bag is made of food
Must-have for emergencies and/or survival situations
Awesome setup for a survival bag
Light weight and good for backpacking

Best For Hydration Pack: Sagan Life Gravity Purifier

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The sagan life gravity purifier is capable of outshining several other purifier featured in this list in overall features in its price range. The SAgan Life Inline purifier is easy to add to your existing hydration bladder pack for backpacking, hiking, and climbing. It uses the effective journey purification filter. The Filter has been tested and proven to remove 99.9999% Bacteria, 99.99% of Parasites and Protozoa, such as Cryptosporidium and Giardia and 99.99% of Viruses. The product includes two (2) 1/4 inch quick connect pieces to plug into your hydration bladder’s tube. It is ideal for global traveling, outdoor adventures, emergency preparedness, hiking, backpacking, mountain biking, camping, fishing, and is the best survival water purifier due to its effectiveness.

The INLINE is easy to use and since it's basically a Journey Filter designed a little differently, to fit a hydration pack. The water purification filter removes e.coli, salmonella, cholera, giardia, cryptosporidium, lead and heavy metals toxins.

Why We Like This:

Perfect water purification solution for all who use hydration bladders in their backpacks
Include in disaster kits and bug out bags
Ideal for hiking, camping, travel and emergencies
Ideal portable water filter for hiking, camping, backpacking