Tannins...looks like you're filtering urine!
There are a couple "ponds" you can find using google or bing maps. Here's one about half way.
When getting stale water like this, I prefilter it well. Then I throw in a chlorine dioxide tablet for good measure. Then I filter it thru my sawyer. The chlorine dioxide can take up to 4 hours, but I never wait that long. That's a worse case scenario for crpyto, using cold water. But that's up to the individual to decide and chance.
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