• Membrane Solutions Personal Water Filter Straw S1
  • Water filter straw, Membrane Solutions Personal Water Filter Straw S1, with aqua body, dark blue caps and branding.
  • Membrane Solutions Personal Water Filter Straw S1
  • Membrane Solutions Personal Water Filter Straw S1
  • Membrane Solutions Personal Water Filter Straw S1
  • Membrane Solutions Personal Water Filter Straw S1
  • Membrane Solutions Personal Water Filter Straw S1
  • Membrane Solutions Personal Water Filter Straw S1
  • Membrane Solutions Personal Water Filter Straw S1
  • Membrane Solutions Personal Water Filter Straw S1
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Membrane Solutions

Membrane Solutions Personal Water Filter Straw S1

Membrane Solutions Personal Water Filter Straw S1

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The Membrane Solutions S1 Personal Water Filter Straw delivers reliable, on-demand hydration for outdoor adventures and emergency preparedness. Engineered with a 0.1-micron hollow fiber ultrafiltration membrane and multi-stage filtration, it effectively removes sediments, coliforms, and chlorine taste from freshwater sources.

Featuring standard 28mm threading, this compact and lightweight filter easily attaches to standard disposable bottles, gravity hydration bags, or functions directly from natural streams. With a durable, BPA-free construction and a high-capacity lifespan of up to 1,320 gallons, it provides an essential purification solution for hiking, camping, and survival kits.

Key Features

Brand Membrane Solutions
Model Name S1
Filtration Pore Size 0.1 Micron
Filtration Capacity 1320 gal
Purification Method 5-Stage: Hollow Fiber Ultra Membrane, Activated Carbon, Double PP Cotton, Coarse Filter
Thread Compatibility 28mm Standard Bottle Threading
Material BPA-Free Plastic
Power Source Manual / Non-Electric
Dimensions 8.1 in L x 2.2 in W x 1.6 in H
Item Weight 2 oz
Max Supported TDS Level 1000 PPM

Highlights

  • High-efficiency 0.1-micron hollow fiber ultrafiltration membrane
  • Filters up to 1,320 gallons of freshwater
  • Standard 28mm thread connects easily to common disposable bottles and gravity bags
  • Compact, lightweight 2 oz design ideal for camping, backpacking, and emergency kits
  • Certified to NSF/ANSI standards 42, 372, and 401

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Materials & care

Constructed from durable, BPA-free plastic housing and medical-grade hollow fiber membranes. Always backwash using fresh, clean water after each outing to clear sediments. Store dry in a cool, protected environment away from extreme temperatures and ozone; not suitable for filtering saltwater or chemical contaminants.

Compatibility

Compatible with standard 28mm threaded water bottles and standard hydration gravity systems, including 6L gravity bags.

How to use

When the filter is dry, submerge the lower end in fresh water for 1 to 2 minutes or prime through the mouthpiece until wet. Sip directly from the water source, screw onto a 28mm-threaded water bottle for squeeze filtration, or attach inline with a compatible gravity system. After use, backwash with clean freshwater and let it air-dry vertically before storage.

Frequently asked questions

What is the shelf life of this water filter straw?

The personal water filter straw has an indefinite shelf life when unused and stored in a protected environment with moderate temperatures.
Can this filter be attached to bottles or gravity bags?

Yes, it features 28mm threading that connects to standard disposable water bottles for squeeze filtration and serves as a replacement filter for compatible gravity systems.
How do you prepare the straw for quick drinking when dry?

Place the filter upright in clean freshwater for 1 to 2 minutes or rinse through the mouthpiece under tap water until the internal membrane is primed and wet.
Does this water filter work on seawater?

No, this filter is designed exclusively for freshwater sources and cannot desalinate or filter seawater.
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Frequently Asked Questions

What does the Membrane Solutions Personal Water Filter Straw S1 filter out?
The Membrane Solutions Personal Water Filter Straw S1 uses a 0.1-micron hollow fiber ultrafiltration membrane and multi-stage filtration to remove sediments and coliforms from freshwater, and to remove chlorine taste. It is not suitable for saltwater or chemical contaminants.
How do I use and clean the S1 water filter straw?
If the filter is dry, submerge its lower end in fresh water for 1 to 2 minutes or prime it through the mouthpiece until wet. Sip directly from the source, connect it to a compatible bottle or gravity system, then backwash with clean freshwater after use and let it air-dry vertically before storage.
How long does the Membrane Solutions S1 filter last, and what bottles fit it?
The filter has a stated capacity of up to 1,320 gallons and a standard 28mm thread. It connects to standard 28mm-threaded water bottles and compatible gravity hydration systems, including 6L gravity bags.