Household Biosand Filter (BSF)¶
BioSand & Media Filters • Est. CapEx: Low-cost / Locally fabricated
Technical Overview¶
A point-of-use water treatment system adapted from traditional slow sand filtration for household deployment in low-resource settings. It uses a concrete or plastic vessel filled with layers of gravel and specifically graded sand to remove pathogens, suspended solids, heavy metals, and turbidity without chemicals or electricity. Over 200,000 units are in use worldwide, and studies correlate BSF use with up to a 47% reduction in diarrheal disease.
Key Specifications & Engineering Parameters¶
| Parameter | Specification |
|---|---|
| Category | BioSand & Media Filters |
| Capital Cost | Low-cost / Locally fabricated |
| Primary Mechanism | Contaminated water is poured into the top reservoir and passes through a diffuser plate into a fine sand column (effective size 0.15–0.20 mm). A biological active layer (schmutzdecke) forms on the sand surface where microorganisms consume pathogens, while physical processes including mechanical trapping, adsorption, and natural predation occur throughout the sand bed. Filtered water exits via a drainage tube surrounded by supporting gravel layers that prevent sand from clogging the outlet. |
| Target Scale | Household / Village Cluster |
| Standard Lifespan | 10 - 20 Years |
Cross-Reference & Interactive Tools¶
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