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I added activated carbon to an MSR siltstopper. This has the added benefit of filtering out the silt before it gets to my sawyer inline filter. I've been using this for a couple of years and it has worked well. Water is clean and clear. However, I've been considering trying this out as well
http://cascadedesigns.com/platypus/filtration-and-storage/gravityworkscleanstream-carbon-element/product
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