Membrane Solutions S1 Personal Water Filter Straw
- Item Weight: 0.12 pounds
- Maximum Flow Rate: 500 milliliters per minute
- Container Type: Bag,Bottle
- Power Source: Corded Electric
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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ASIN: B07SYYQZDNModel: S1Category: Camping Water Filters
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Overview
A compact personal filter straw carrying NSF/ANSI 42, 372, and 401 certification, built to thread onto a 28mm bottle and rated for 1,320 gallons through a 5-stage, 0.1 micron system.
The straw's certifications cover taste and chlorine reduction (NSF 42), lead-free materials (372), and microplastic and particulate reduction (401), which is more third-party testing than many straw filters in this price range disclose. At 7.1 inches and 2 ounces it is built to live in a glove box, pack pocket, or bag rather than replace a bottle system, and both ends unscrew for backflushing to extend its life.
- 1,320 gallon (5,000 L) rated capacity
- 0.1 micron, 5-stage filtration
- Fits any 28mm threaded bottle
- Triple NSF certification: 42, 372, 401
Who it's for
Good for hikers, travelers, and anyone assembling an emergency or car kit who wants a small backup filter rather than a primary hydration system. Less suited to filling large volumes quickly, since it is sized for personal, direct-from-source drinking rather than a group or gravity setup.
Pros and cons
- Personal straw format, not built for filling multiple containers
- Several buyers have only kept it stored for emergencies, untested in daily use
Performance notes
Water passes through five stages, a coarse screen, layered PP cotton, coconut shell activated carbon, and a hollow-fiber ultrafiltration membrane, at up to 500 ml per minute; the maker notes it does not lower TDS, so mineral content passes through while the 0.1 micron membrane and carbon stage handle particulates, chlorine taste, and microplastics.
Specifications
| Brand | Membrane Solutions |
|---|---|
| Model | S1 |
| Dimensions & fit | |
| Item Weight | 0.12 pounds |
| Item Dimensions L x W x H | 8.1 × 2.2 × 1.6 inches |
| Capacity & performance | |
| Maximum Flow Rate | 500 milliliters per minute |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Material Type | Plastic |
| Included components | |
| Number of Packs | 4 |
| Unit Count | 4 |
| Included Components | User Manual |
| Warranty & support | |
| Supported Water TDS Level Maximum PPM | 1000 |
| Warranty Description | 1 year |
| Other details | |
| Container Type | Bag,Bottle |
| Number of Items | 4 |
| Part Number | Water Filter Straw |
Frequently asked questions
Is the Membrane Solutions S1 straw independently certified?
Yes, it carries NSF/ANSI 42, 372, and 401 certification for taste, materials, and particulate reduction.
What bottles does it fit?
Any bottle, cup, or glass with a standard 28mm threaded opening.
Does it affect the taste or mineral content of the water?
The carbon stage improves taste and reduces chlorine, and the maker states it does not lower TDS, so minerals remain.