I spent many years as an engineering research scientist in a university environment. One of my favorite research programs that I managed included a number of multi-year portable water treatment technology and water quality studies, in the context of backcountry recreation, military deployment, and disaster relief.
It was during these years where I learned to despise portable water filters for their weight, slow treatment times, effort (arg, the pumps!), ease of clogging, and difficulty of cleaning.
It is because of these disadvantages that I’ve learned to love ultralight treatment technologies like tablets and chemical kits.
Filters of course have evolved through the years. We’ve seen lighter pump filters, gravity filters, inline filters, and filter bottles.
But not until the introduction of the new Katadyn BeFree Water Bottle Filter have I experienced a (truly) lightweight filter option that treats water as fast, in a package so compact. The 0.6L bottle is about a 2-oz package (2.5 oz is the approximate wet weight that I measured, that includes residual water from a treatment cycle), and it comes in a larger 1.0L size as well.
Watch the video to see my brief commentary about the filter and what I think about its throughput using clean water. Stay tuned for a more comprehensive review – I’m using this as my primary water treatment technology this summer and fall.
The Katadyn BeFree Filter Product Line
The larger, 1-L version.
The smaller, 0.6-L version.
A gravity flow version for larger water volumes / groups.
Replacement cartridge...or...a DIY part for the innovative MYOG'er!
- Filter medium: Hollow fiber membrane with 0.1 micron effective pore diameter;
- Filters bacteria: yes (99.9999%) | protozoa: yes (99.99%) | viruses: no
- Flow rate: 2 L/min
- Bottle opening: 43mm
- Longevity of filter cartridge: 1,000 liters
As I mentioned in the video, I’ve been partial to a chemical kit (Aquamira) for many years. Its “durable” (no mechanisms to fail), imparts minimal taste (and actually improves the taste of nasty water sources), is light, doesn’t fail when freezing (filters can crack), and is simple to use. There’s still a wait time with Aquamira (on the order of 15-30 minutes depending on the quality and temperature of your water source).
I’ve also used Steripens and gravity filters in various contexts. There are a lot of different ways to treat water in the backcountry!
Chemical water treatment kits like Aqua Mira are the gold standard among ultralight backpackers for their ease of use and reliability.
Disclosure: some of the links above may be affiliate links, which means if you place an order at one of these retailers, we receive a small commission on this sale. This helps support Backpacking Light, thank you!
Related Links / Mentions:
- Katadyn BeFree Water Bottle
- Ultraviolet Treatment Pen
- Chlorine Dioxide Chemical Kit
- ClO2 Tablets: here and here
- End of the World Filter
- Ultralight Filter Straw
- Ultralight Inline Filter
Also check out this forum topic at Backpacking Light discussing other user’s experiences with the Katadyn BeFree!