Wilderness Charcoal Water Purification Filter
An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 8 to 14.
Materials Needed
- • Plastic 2-liter beverage bottle (1 unit)
- • Hardwood lump charcoal (crushed) (1 cup)
- • Fine sand and coarse gravel (1 cup each)
- • Cotton balls or clean cotton bandana (1 piece)
- • Muddy water sample in a jug (2 cups)
Pro Tips
- → Crush pure hardwood lump charcoal (never match-light briquettes with lighter fluid) into fine pea-sized granules.
- → Pack layers in inverted order: cotton plug, charcoal, fine sand, coarse sand, and top gravel.
- → Pour dark, muddy puddle water through the top and watch it emerge clear from the cotton neck.
Safety First
Do not drink field-filtered water without boiling; this is an empirical proof-of-concept for sediment/toxin removal.
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Step-by-Step Instructions
Step 1
Cut the bottom off a 2-liter bottle, invert it spout-down, and stuff a clean bandana or cotton ball tightly into the neck.
Step 2
Crush natural hardwood lump charcoal into small bits and pour a 5 cm layer over the cotton.
Step 3
Add a 5 cm layer of clean playground sand, followed by a 5 cm layer of coarse river gravel on top.
Step 4
Pour a cup of dark muddy water into the top gravel and collect the filtered water in a clear cup below.