Originally Posted By: quick_joey_small
Here's a newer list:

https://youtu.be/aUJUQpTnVng?t=1094

Note the survival straw has a filter that is 0.05 microns. Anyone know does that mean it'll get rid of absolutely everything?

And this is most recommended OVER $30:

https://youtu.be/1VZJDzJenos

qjs


I'm not an expert but as I understand it, no single treatment modality will get rid of absolutely everything, especially in the field.

In most parts of the USA, we should be concerned with removing or killing microbes from drinking water before consuming it. Filters, chemicals, UV devices, SODIS, and boiling can all work to disinfect water. Generally, one of these methods is enough, especially if dirt and debris is removed from the water first. So a coarse filter (like a shirt, handkerchief, coffee filter, or similar) should be used to get those larger particles out before taking steps for disinfection, especially if the water is visibly turbid.

In some places, heavy metal and other chemical contamination is also a concern. Disinfection techniques are generally not sufficient to make the water safe in those cases. I don't know of a reliable field-portable way to purify water against all possible contaminants; it may be possible to use a portable method that works well against a specific contaminant in the area you're in.