my last long hike was five days, I used a msr filter but the handle broke, I went to rei to get a replacement part but was told you can not buy just the brokenparts. So on short hikes I am now using iodine tabs. But google does not return any info on microorganisms from any specfic areas. example my hiking is done where lots of wildlife elk, cattle and coyote, racoons etc.
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Many reach for distant shores only to run to the safest harbor.