>>2556560
>Aren’t those diseases spread via fecal matter
They enter the water system via faecal matter but that doesn't mean you're safe so long as you don't start chowing down on floating turds, turbulence will spread them throughout the area and theyre perfectly capable of surviving as free-floating virions. A water filter won't protect you from viral illness just because it filters out faecal material.
Oh and theoretically urine, respiratory secretions and other bodily fluids could contaminate the water supply but in practice they tend to be fairly insignificant.
>In places with high population densities and substandard municipal water infrastructure?
Yes, like I said "only a concern in developing countries, especially crowded campsites and potential shtf/natural disaster scenarios"
Viral contamination of water sources became a serious problem with all the idiots flocking to national parks during the pandemic. Literally shitting the place up.

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How Does /out/ Filter Their Water?