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Purifying Water with a Natural Filter — Charcoal, Sand & Gravel
Build a three-layer water filter from charcoal, sand, and gravel. Important: always boil filtered water for 1 minute — filtration alone does not kill all pathogens.
初学者
30-45 minutes
说明
1
1
Filter Layer Diagram
Filter Layer Diagram
Water flows top to bottom through three layers: charcoal (chemical filtration) → sand (physical filtration) → gravel (structural support). Always boil after filtering.
Flow
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2
2
Make Charcoal
Make Charcoal
Burn hardwood until fully black. Smother with sand to stop combustion. Cool, then crush to pea-sized pieces. ~2 cups needed.
所需工具：
取火工具
美工刀3
3
Assemble Filter
Assemble Filter
Container (bark cone, hollow log, or cut bottle). Grass plug at drain. Layer: 5-8cm gravel, 8-10cm sand, 5-8cm charcoal, thin gravel cap on top.
设计
Cross-section: labeled layers with measurements
此步骤所需材料：
容器1 个
火绒束1 把
砾石2 杯
细砂3 杯
木炭（破碎）2 杯4
4
Filter & Boil
Filter & Boil
Pour water slowly. Discard first dark batch (charcoal dust). By third pass, water runs clear. ALWAYS boil 1 minute before drinking.
所需工具：
取火工具CC0 公共领域
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