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Okay, I have never used Alum to hasten the settling of silty water.
Bought a 2 oz jar of it in the grocery store today. But who can tell me how much silty water that will treat? I understand it probably depends on just how silty the water is, buy maybe some of you can give me some ruff guidelines?
thanks,
Billy
I was curious as well, took 30 seconds to find an answer
http://www.paddling.net/guidelines/showArticle.html?858
A twelve ounce (340 gram) bottle contains enough alum to settle about 24 gallons of silty water.
Not sure of your exact use case, so forgive me if this isn’t helpful, but I used a sawyer squeeze (full sized not mini) for water in Alaska that was full of glacial silt to the point where it looked like milk. I had to backflush every 3 liters or so…but it worked for a 5 day trip.
Settling silty water and/or alum treatment before filtering might depend on the suspended sediment.
On raft trips in the Grand Canyon, large commercial Katadyn ceramic filters clogged nearly instantly on raw, silty Colorado River water. We settled water overnight in 5 gallon buckets, and the bottom half-gallon or so was sludge. Had alum as a backup if we needed to settle water in a hurry, but never used it.
— Rex
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