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Will do. I've also used alum for filtering silty river water in the desert rivers in the Southwest where I live. My concern is with all of the irrigation runoff from all the farms along the Yellowstone River and it's tributaries in the water that we would be filtering to drink and cook with...

A friend and I are launching from Gardiner, Montana, on July 8 and paddling the Yellowstone River all the way to the confluence with the Missouri River. We'll both be in kayaks (apologies because this is a canoe tripping forum) and have been wondering about how safe the water would be to filter...