On my last camping trip I decided to put it to the test. I did some modifications for my design. I wanted to limit it to one bandana, and simply layer the materials in that bandana. I did a base layer of sand, then rocks, then dry grass. MAJOR FUNCTIONALITY NOTE!!! This type of filter is NOT meant to make water safe to drink. It does not remove any kind of pathogens, or water born illness. It is meant to remove sediment making it easier to prepare for boiling or some other form of treatment.

I started by making a 4 sided "quadpod". I make this the same way I would a tripod, but with an extra pole (for those really bad at math). Start with 4 equal length branches.