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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.
Oqalayo
30-45 minutes
Imiyalelo
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.
Tools needed:
Fire Starter
Utility Knife3
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.
Design
Cross-section: labeled layers with measurements
Materials for this step:
Container1 ucezu
Tinder Bundle1 isandla esigcwele
Gravel2 izinkomishi
Fine Sand3 izinkomishiCharcoal (Crushed)2 izinkomishi
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.
Tools needed:
Fire StarterIzinto
5- 1 isandla esigcwelePlaceholder
Amathuluzi Adingekayo
2- Placeholder
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CC0 Isizinda Somphakathi
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