Sand & Charcoal Water Filtration
Practical treatment of water by letting water pass through sand and related porous media to remove visible impurities.
Core metadata
- ID: water_filtration_sand_charcoal
- Era: Classical
- First known date: -400 (century)
- Region: Ancient river-bank and urban water-treatment traditions
- Review status: source_checked
- Maturity: established
Prerequisites
Dependents
Fields
Field lanes
- Water & Sanitation Systems: Drinking Water Treatment
Node sources
- Filtration (Encyclopaedia Britannica, 2026, textbook) • Supports: node, maturity
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 2
- Average edge confidence: 50%
- Prerequisite sources: 2
- expert_inference: 1
- weak_inference: 1
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Pottery (pottery) | common_dependency | 52% | expert_inference | Vessels help collect and handle filtered water, but the Britannica example of river-bank sand filtration does not require pottery. |
|
| Charcoal Production (charcoal_production) | common_dependency | 48% | weak_inference | Charcoal is a later or alternate filter medium; sand filtration is independently attested, so charcoal is contextual rather than required. |
|
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