Membrane Solutions S1 Personal Water Filter Straw
- 4 filter straws in the pack
- 0.1 micron hollow fiber membrane
- 1320 gal filter capacity
- 500 mL per minute maximum flow
- NSF/ANSI 42, 372, 401 per the title
- 2 oz, fits 28mm bottles
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A four-pack of lightweight personal filter straws for hiking and emergency kits, with a hollow fiber membrane and carbon stage. They filter water for drinking only and are not a desalinator.
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ASIN: B07SYYQZDNModel: S1Category: Camping Water Filters
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Overview
A hiker beside a stream can drink through this straw, which uses a five-stage filter with a fine membrane and a carbon stage. It also fits a 28mm bottle thread, and a user manual comes with it.
Low weight and a long rated capacity are the reason to look at it for packs and emergency kits. The limitation is that the listing's claims come from the seller and the unit works only up to a stated mineral content.
Who it's for
Hikers, campers and emergency kit builders who want a simple, light filter get a four-pack. Travelers needing virus or desalination treatment should check other products.
Pros and cons
- Four filters in the pack
- Fits a 28mm bottle
- Not a desalinator
- Dissolved solids limit stated
- Seller claims, not independent tests here
Performance notes
Water passes through fine pores that stop bacteria and particles, and activated carbon helps taste. Flow rate depends on how hard you draw, and the dissolved solids ceiling marks its working range.
Specifications
| Brand | Membrane Solutions |
|---|---|
| Model | S1 |
| Dimensions & fit | |
| Pore size | 0.1 micron |
| Item weight | 2 ounces |
| Item Dimensions L x W x H | 8.1 x 2.2 x 1.6 inches |
| Capacity & performance | |
| Maximum Flow Rate | 500 milliliters per minute |
| Capacity | 1320 gallons |
| Included components | |
| Unit Count | 4 |
| Warranty & support | |
| Supported Water TDS Level Maximum PPM | 1000 ppm |
| Warranty Description | 1 year from purchase |
| Other details | |
| Purification Method | 5-stage: hollow fiber membrane, activated carbon, double PP cotton, coarse filter |
Closest rivals on specs
LifeStraw Personal Water Filter- Item Weight 0.12 vs 0.1 pounds (+20%)
Katadyn BeFree 1L Collapsible Water Filter Bottle- Item Weight 0.12 vs 0.14 pounds (-14%)
Frequently asked questions
Does the Membrane Solutions S1 remove salt or chemicals?
No. The listing gives a maximum TDS of 1000 ppm, and the NSF/42 note covers chlorine and taste, not salt removal.
What bacteria does the S1 filter?
The listing claims 99.9999% removal of coliforms including E. coli, and gives tested figures for other organisms.
Does the S1 fit a bottle?
Yes. The title says it fits a 28mm bottle.