Used coffee grounds for water purification.

I found myself wondering if you could make activated charcoal out of those used coffee grounds and salt as well. (http://ift.tt/2DsH06B)

It would seem so:
http://ift.tt/2D4iJTe

If you're one of those folks who can't live without your coffee and stored a lot of coffee/green coffee beans, don't waste the chaff when roasting or the spent grounds after brewing. They are an available low-tech (versus reverse osmosis), nontoxic (versus activated alummina) solution to water purification where certain heavy metals and other nonorganic contamination is concerned. (And any lingering coffee color/taste can be removed by further filtration.) They can remove lead contamination for water as is, without conversion to activated carbon.

http://ift.tt/2D32C8R

http://ift.tt/2D4qicR
(Note: Silverskin is the official name for that chaff you blow off your roasted green coffee beans.)

So you have good reason to store lots and lots of green coffee beans in your survival stash (as if most of us needed any excuse to do that. ).

If you think there's a lead problem with your drinking water now, run it through a container of old coffee grounds or some coffee chaff (from your own roasting or that you offer to take off the hands of your local coffee roaster for free) and then put the result through your standard ceramic/carbon or other filter.

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Used coffee grounds for water purification.