1.BioSand Filter Clean Water Project: Focus on India Sponsoring Organizations: South Asia Pure Water Initiative, Inc. www.sapwii.org Friendly Water For the World www.friendlywater.net Translated in Hindi by : Lalit Wadher

2. 3. . 4. () ---- 80% 35 - 10000 , 4000 (60 ) :- Fecal colieform, typhoid, rotavirus, cholera and hepatitis Parasites, protozoa, amoeba, cryptosporidium and other microorganisms Heavy metals such as zinc, copper and lead 5. o o o o o 6. ?? 4 Processes of Filtration 1.1. PredationPredation 2.2. AdsorptionAdsorption 3.3. MechanicalMechanical TrappingTrapping 4.4. Natural Die OffNatural Die Off 7. ?? 1. 8. ?? 2. . DiffuserDiffuser PlatePlate 9. ?? 3. BB 10. ?? 4 SandSand BedBed 11. ?? 5 LargeLarge GravelGravel FineFine GravelGravel 12. ? :- 98% 99% , 100% 95% , , 95% 93% - 100% 13. ( ) 30 - - / (84 ) 14. - 15. 16. , - 17. !! 18. 19. 20. !!!