How to Build a Homemade Water Filter
Things You'll Need
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2 liter soda bottle
Straw
Sand - fine and large grain
Gravel – fine and large grain
Charcoal granules
Cotton batting
Coffee filter
Instructions:
1. Cut the bottom off the two liter bottle. Cut a hole in the lid and insert the straw in the
hole so the filtered water will flow out of the straw.
2. Insert the cotton batting at the bottom of the bottle. Layer charcoal granules, fine
grain sand, larger grain sand, fine grain gravel and large grain gravel. Alternate these
layers until you reach the top of the bottle. Add the coffee filter on top of the last layer
of gravel.
3. Once you have everything in place, pour water through the coffee filter. The water will
work through the layers to remove the impurities. The cotton batting at the bottom
works as the final layer to catch particles from the sediment.
4. The water will flow out of the straw and into your contain.
Tips:
 Adding a couple of drops of chlorine will help eliminate any remaining bacteria.
 Make sure the sand and gravel have been thoroughly washed before you use them or
the water will be dirty.