Membrane Solutions Straw Water Filter S1 - Portable Survival Filter

In this review the Membrane Solutions Straw Water Filter S1 is assessed for outdoor and emergency use; it stands out as a compact, lightweight water purifier best suited to hikers, campers and preparedness kits because it combines a 5-stage filter with a very small 0.1 micron pore size while remaining palm-sized and easy to carry. The single biggest reason to buy is the combination of high filtration accuracy and portability that lets users obtain drinkable water quickly from streams, bottles or cups without bulky gear.

Key Features

• 5-Stage Filtration: A coarse screen, double layer PP cotton, coconut shell activated carbon and hollow fiber membrane work together to remove particulates and improve taste for safer drinking water.
• 0.1 Micron Pore Size: Smaller pores than many competing straws increase filtration accuracy while maintaining a practical flow rate for immediate use in the field.
• Portable and Lightweight: At about 6.7 in long, 1 in diameter and 2 ounces, the straw fits pockets, backpacks and survival kits without adding bulk.
• Long Service Life: The filter is rated to provide up to 1500 liters (396 gallons), which supports repeated use on extended trips or in emergency situations.
• Maintains Mineral Balance: The filtration does not lower TDS value, so essential minerals in the source water remain intact while contaminants are reduced.

Who It's For

The Membrane Solutions Straw S1 is ideal for hikers, campers, scouts and anyone building an emergency preparedness kit who needs a small, immediate water treatment option. It suits travelers and day-users who will drink from natural sources or share bottled water but want extra assurance about clarity and taste.

Those who need purified water for long-term household use, large groups, or who require chemical disinfection for viral threats should consider larger pump filters or chemical treatments instead; this straw is designed for individual, portable use rather than whole-house or high-volume domestic filtration.

Pros & Cons

Pros

• Compact and extremely portable, making it simple to carry on hikes or in a survival kit.
• High filtration accuracy with a 0.1 micron hollow fiber membrane improves particulate removal and clarity.
• Multi-stage filtration with activated carbon helps reduce odors and improve taste.
• Long rated lifespan up to 1500 liters provides good value for extended use.

Cons

• Some users report inconsistent durability, with isolated cases of unit failure after limited use, so occasional longevity concerns exist.
• Does not lower TDS, so dissolved salts and some minerals remain in treated water.

Specifications

Our Verdict

The Membrane Solutions Straw Water Filter S1 is a practical, cost-effective tool for individuals who need reliable, on-the-go water treatment. Its 0.1 micron membrane and multi-stage design deliver noticeably clearer, better-tasting water while the tiny size and long rated life make it excellent value for hikers, campers and emergency kits. Buy it if you want a lightweight personal filter; consider larger systems for household or group needs.

Frequently Asked Questions

How long will the filter last?
The manufacturer rates the straw for up to 1500 liters (396 gallons) of use, though actual lifespan depends on water quality and usage.

Can it remove viruses and chemicals?
The hollow fiber and activated carbon reduce particulates and improve taste; it is not a substitute for chemical disinfection for all viruses or for complete chemical removal.

Will it fit my water bottle?
At 6.7 in long and 1 in diameter the straw is small enough to fit most bottles, cups and glasses for convenient use in the field.