After a decade of playing with different prefilters (CNOC/Sawyer gravity system), I finally designed my own.

Macchina

Lil-Rokslider
Joined
Jan 16, 2015
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I backpack a lot were the only water sources are stagnant ponds and hunt a remote location where we have to filter from a fast moving stream coming out of a swamp. After dealing with clogged filters for years I started to experiment with putting an inline filter above my Sawyer to grab the bigger bits before they could get into the actual filter. I had a few leaky cups that used coffee filters and worked OK but tended to allow untreated water to run down the hose and get into the clean water occasionally.

I sat down this winter and designed up a stand-alone unit that attaches directly to a Sawyer Squeeze and CNOC bag.

Took me about 10 prototypes but landed on a fun design that uses pre-cut cylinders of pre-filter material to grab all the crap (algae, sediment, clays, etc). Been using this for this season and could not be happier. Using the fiber filters is much better than the coffee filters I used to use as they clog slower and are much easier to clean and reuse! I've found cotton balls also work and are burnable/biodegradable if buried in a cat hole.

Also gives a spot to hang the clean hose and shut off the flow when you've filled your bottle so the hose stays out of the dirt.

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That's great! Are you selling them or selling/sharing the files for users to 3d print their own?
 
Thanks man! I don't think I'll share the files, took me way too long to get it to work right, LOL. Designing and 3D printing threads that work correctly is quite difficult to get right.
I do sell them on eBay (don't know if I'm allowed to link to it)..
 
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