The Bio Sand Waterfilter
The bio sand filter has six different distinct zones:
Meribah Bio Sand Waterfilter
- Inlet Reservoir: Space above the sand and gravel media which allows for a full pail of water.
- Standing Water: Oxygen diffuses through the standing water to the bio layer.
- Bio layer: Layer of slime, sediment, and microorganisms which develops at the top 1-2 cm (0.4-0.8”) of the sand surface.
- Biological Zone: Develops at the top 5-10 cm (2-4”) of the sand surface. The sand absorbs pathogens, iron, and other small particles.
- Sand Zone: Contains virtually no living microorganisms due to lack of nutrients and oxygen.
- Gravel Zone: Holds the sand in place which protects the outlet pipe from clogging and allows for the smooth flow of water.
The Results
Overall, studies have shown that the Bio Sand Filter removes:
- > 97% of E. coli - an indicator of fecal contamination (Duke, 2006; Stauber, 2006)
- > 99% of protozoa and helminths (Palmateer, 1999)
- 80-90% of viruses (Stauber, 2005)
- 50-90% of organic and inorganic toxicants (Palmateer, 1999)
- 90-95% of iron (Ngai, 2007)
- Most suspended sediments
Based on slow sand filter research, the bio sand filter may also remove some heavy metals (Muhammad, 1997; Collins, 1998).
There is also a design modification known as the KanchanTM Arsenic Filter that is effective in removing both pathogens and 85-90% of arsenic from source water (Ngai, 2007).
Links
- Biosand Filter
- Clean Drinking Water
- Easy to Use
- Self contained Maintenance
- For Everybody
- No Following Costs
- Reliable
Pages in category "Water filters"
The following 35 pages are in this category, out of 35 total.
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- Seradisc Variable Screen Filter
- She-ba low cost water filters for rural households
- She-ba low cost water filters for rural households/ko
- She-ba low cost water filters for rural households/vi
- Slow sand filtration
- Slow sand filtration water treatment plants
- Slow sand filtration/kn
- Slow sand filtration/ko