Does it remove viruses or chemicals?

No. It is rated for particles down to 0.2 microns plus carbon taste improvement, which covers sediment, microplastics and many bacteria, but it makes no virus or dissolved-chemical claim. For questionable water, pair it with a purifier or boil.

How long does the filter last?

The stated capacity is about 5,700 liters (1,500 gallons), far more than most pocket straws. Real life depends on water quality: silty or muddy sources clog the pre-filter and membranes sooner.

Will it fit my water bottle?

It is described as threading onto standard water bottles, hydration pouches and cups. Bottle neck threads vary, so check that your bottle's opening matches before relying on it in the field.

Can I drink straight from a stream with it?

Yes, that is the main use: dip the straw into a stream, lake or river and drink through it. The pre-filter keeps out leaves and large grit, but avoid very muddy water, which clogs it fast.

Is it good for an emergency kit?

It is small, light and needs no power or pumping, which suits a go-bag. Its long capacity means one straw covers a household for a long stretch, though it is not a substitute for stored water.

How do I keep it working?

Flush it with clean water after each trip and let it dry before storage. Backflush when the flow slows; a clogged carbon stage or membrane cannot be cleaned back to full flow.

Where is the Pure Flow Water Filter Straw cheapest?

At Walmart, for $17.01, as of our latest check.

Unbranded

Pure Flow Water Filter Straw

Best price now

$17.01at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

Unbranded

Pure Flow Water Filter Straw

Best price now

$17.01at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $17.01 at Walmart on Nov 10.

Our take on the Pure Flow Water Filter Straw

The Pure Flow is a personal filter straw that you drink through directly or thread onto a standard water bottle, hydration pouch or cup. It uses a five-stage path — pre-filter, activated carbon and ultra-fiber membranes — rated to reduce particles down to 0.2 microns and microplastics at 1 micron, with a stated capacity of about 5,700 liters. That capacity is far above most pocket straws, which typically run 1,000 to 2,000 liters, and the carbon stage is meant to improve taste as well as clarity. It is a no-frills, unbranded option: it does not claim virus or chemical removal, and it has no pump or squeeze assist, so it suits hikers, travelers and emergency-kit builders who want a light backup rather than a full purifier.

Best forHikers and backpackers wanting a light backup filterTravelers wary of tap water abroadEmergency and disaster-preparedness kitsCampers filtering from streams and lakes

Pros

Long stated capacity of about 5,700 liters
Five stages including activated carbon for taste
0.2-micron membrane reduces microplastics and sediment
Threads onto standard bottles and hydration bladders
BPA-free food-grade plastic, compact and light

Cons

No claim of virus or dissolved-chemical removal
Unbranded, so no published lab test results
Drinking through a straw takes effort on long pulls
Carbon stage and membranes can clog in silty water
No squeeze bulb or pump to help move water

Pure Flow Water Filter Straw prices at every store

WalmartNew
In stockSold by Chic ErReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$17.01Free shippingChecked Nov 10
Visit Walmart

About the Pure Flow Water Filter Straw

The Pure Flow Water Filter Straw is a compact, portable water filter for hiking, camping, international travel and emergency kits. It filters water from natural sources such as streams, lakes and rivers into cleaner drinking water.

It uses a 5-stage filtration system with a pre-filter, activated carbon and ultra-fiber membranes. The filter traps microplastics, sediment and floating particles down to 0.2 microns, and it improves water clarity and taste. It can filter up to 5,700 liters (1,500 gallons) of water.

The straw is made from BPA-free, food-grade plastic. It threads onto standard water bottles and attaches to hydration bladders and cups.

Product type: Portable emergency water filter straw
Capacity: Up to 5,700 liters (1,500 gallons)
Filtration: Reduces particles down to 0.2 microns; filters microplastics at 1 micron
Filter system: 5-stage: pre-filter, activated carbon, ultra-fiber membranes
Material: BPA-free, food-grade plastic
Compatibility: Standard water bottles, hydration pouches and cups
Uses: Hiking, camping, emergency preparedness, survival gear, outdoor travel
In the box: 1 x Pure Flow Water Filter Straw

Specifications

color: OtherSource
actual_color: 1PCSSource

Questions and answers

Does it remove viruses or chemicals?: No. It is rated for particles down to 0.2 microns plus carbon taste improvement, which covers sediment, microplastics and many bacteria, but it makes no virus or dissolved-chemical claim. For questionable water, pair it with a purifier or boil.
How long does the filter last?: The stated capacity is about 5,700 liters (1,500 gallons), far more than most pocket straws. Real life depends on water quality: silty or muddy sources clog the pre-filter and membranes sooner.
Will it fit my water bottle?: It is described as threading onto standard water bottles, hydration pouches and cups. Bottle neck threads vary, so check that your bottle's opening matches before relying on it in the field.
Can I drink straight from a stream with it?: Yes, that is the main use: dip the straw into a stream, lake or river and drink through it. The pre-filter keeps out leaves and large grit, but avoid very muddy water, which clogs it fast.
Is it good for an emergency kit?: It is small, light and needs no power or pumping, which suits a go-bag. Its long capacity means one straw covers a household for a long stretch, though it is not a substitute for stored water.
How do I keep it working?: Flush it with clean water after each trip and let it dry before storage. Backflush when the flow slows; a clogged carbon stage or membrane cannot be cleaned back to full flow.
Where is the Pure Flow Water Filter Straw cheapest?: At Walmart, for $17.01, as of our latest check.