The Sawyer Squeeze is an ultra filter designed to filter sediment and pathogens from ‘wild’ water making it both safe and pleasant to drink. Bacteria and parasites generally fall into the size range of 0.3-10 microns and this filter has a 0.1 micron absolute filtration capability. With filters the word absolute is key, as when used in the context of a filter it means that absolutely all particles above the limit will be held back. And when it comes to removing pathogens you really do want to remove all of them rather than just most. This filter than can achieve this with just the differential pressure you can produce by sucking, which ranges from 2-6 psi depending on the person. Given that in my days as a Tech Support chemist (2001-14), we used to need to use a 60 psi pump to filter through a 1 micron absolute filter, this makes this an impressive filter medium.
The use of a filter sees me seeking to move away from the use of iodate tablets as a way of making ‘wild’ water safe. The aims of making this change were as follows:
- Better tasting water
- Carrying just one litre of water (rather than two) and topping up from en route ‘wild’ sources thus saving 1100g in initial pack weight.
- Instant access to clean water rather than having to wait for the 35 min it takes of iodate to act and then the excess be destroyed with sodium metabisulphate.
- Ability to use water from less ideal sources.
So now that I’ve taken it away on it’s first outing, a four day walk along the Cleveland Way, how did it perform vs. my list of requirements?
I was really impressed how it was able to take the ‘peaty’ taste away from moorland water. As you can see my water source started looking like a single malt. The filtered water was still ‘straw yellow’ but was totally free of any unpleasant taste. A big test was using it to make a cup of Lady Grey tea – I found that it allowed me to enjoy all the subtle flavours within my tea, so that’s a big tick against criterion one. I didn’t draw water from any sources which I would not normally use, other than that I can say it met all my desired requirements. But I also benefits from an unplanned bonus. This being that I was able to use the filter in-line between my dirty water pouch and a drink tube clipped to my shoulder strap. I’ve never felt the desire to use a ‘hydration bladder’ before. When I walk with someone else we are able to pass each other water without need to remove our packs. This is not possible when you are walking solo, something I’ve done a lot of in 2020 and expect to continue with a few times a year. On this first outing I was struggling with a neck muscle strain so hefting my ‘sack on and off less was much appreciated facet.
Ahead of my walk I shook the internet looking for reviewing on drinking tubes and the best liked was that from Platypus (right). I found it good too, but four days of use is far from a true test. One thing I would saw is not to rely on connecting the hose to the 1/4″ connection built into the Sawyer filter outlet. This is really only there to allow back-flushing and with it not being barbed I found my hose coming off a few times. Since then I’ve paid the outrageous price for the in-line adapter kit which is a much better option. (If you are buying a filter I’d recommend getting the SP131 kit which comes with the adapters included)
On the negative side, most of the accessories supplied with the filter seem of very poor quality. The squeeze bags have bad reviews a plenty, so since I would be totally relying on my feed / dirty water bag I sourced a well regarded one from CNOC. The only place I could find with stock in the UK was Peak and Valley. At £20 it’s a very expensive plastic extrusion, but is of considerably higher quality that the Sawyer bags. I plan to use my Sawyer bag as a clean water reservoir as this will not have pressure applied to it in use. As I suspected, having a clean water bag or bottle was useful on my trip. I could use this when I was taking water from a potable source or as ready prepared water during the cooking of dinner.
What about the weight? The ‘dirty water’ bag and tube all add to the mass and totalled 215 g vs. 300 g for two 1 litre Sigg bottles which I would normally carry. So you get all the above benefits with no weight penalty.
For me the primary aim was better tasting water, available more quickly. This the Sawyer certainly achieved with ease on its first outing. I am happy that on many occasions I’ll be able to ‘safely’ carry 1 kg less water, but with my CNOC bag I can carry two litres should I wish. How it performs over time and how it copes with high levels of suspended solids in the water will take time to assess. Other peoples reviews suggest I should be optimistic (which is why I bought the Sawyer Squeeze rather than an alternative or a Mini). My plan would be to post a ‘long term use’ review after another year, so watch this space.