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Carrie  Ge

The charcoal absorbs impurities in water and is actually one of the only ways of removing chemicals from water, such as pesticides and runoff.activated carbon for pharmacy


These instructions for a DIY charcoal water filter are very easy. Yet, it is essentially the same process used in city water treatment facilities (just on a smaller scale).


1. Get activated charcoal

You cannot use barbecue charcoal to make a water filter, the reason being that most charcoal you buy at stores is not pure and could leach numerous chemical contaminants into the water (which defeats the point of making a charcoal water filter). Instead, you will want to make activated charcoal.


In a wilderness survival situation, you could make your own basic activated charcoal out of hardwood.After making activated charcoal, you will need to crush it into a powder.Alternatively, you can buy activated charcoal. It is available in bulk on Amazon at a decent price.


2. Rinse your activated charcoal

Before using activated charcoal for filtering water, you should rinse it to remove any impurities on the surface. Then spread it on paper and let it dry. This is the same reason you need to soak a Brita filter before using it and the step is even recommended by NASA.


3. Create your filter vessel

Most survival charcoal water filters are made from 2-liter plastic bottles.If you don’t have a bottle handy, you can use cloth to hold each filter layer (see pictures in section below).Or, if you are very skilled at bushcraft, you can make a cone out of birch bark.


4. Gather pre-filter materials

It is possible to make the filter out of just charcoal. However, any debris, algae, or other scum in the water can clog the top layer of charcoal. For this reason, it’s recommended that you make a layered filter.


Usually gravel and sand are used as pre-filter media. However, I’ve heard of people using things like cotton balls, pieces of concrete, and even uncooked macaroni.


5. Pour water into the filter

Pour water into the top layer of the filter. This is technically a “gravity filter” as you have to wait for the water to work its way through each of the layers. Yes, it will take a while!