Biosand Water Filters

A Project By AGCS Kolkata

What We Do

Community Health Promotion
Production of Biosand Water Filter
Installation of Biosand Water Filter
Water Testing (before and after installation)
Follow ups visits
Consultancy and Support

About Us

The Assembly of God Chruch Launched The BioSand Water Filter Project in 2010 in partnership with Mission of Mercy Canada. The Project focuses on providing safe clean drinking water through BioSand Water Filters to the urban and rural poor irrespective of gender , caste or religion.

Come and Join us.

We also give training for Biosand Filter Project to start a new plant.
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India Water Crisis

How Well Does the BioSand Filter Work?

CAWST has prepared a summary of laboratory and field studies for the Biosand filter.It has been proven to remove the following from contaminated water :

Up to 98.5% of bacteria
Up to 99.9% of protozoa
Up to 95% of turbidity
90-95% of iron
70-99% of virus
Up to 100% of helminthes


Although access to safe drinking water has improved, the World Bank estimates that 21% of communicable diseases in India are releted to unsafe water. In India, diarrhea alone causes more than 1,600 deaths daily 97 million people lack access to improved sources of drinking water, second only to China. 626 million people practice open defecation accounts for 59 per cent of the 692 million people in South Asia who practice open defecation; only 33% of the country has acess to traditional sanitation..

Dr. David Manz developed the household Biosand filter in the 1990s at the University of Calgary, Canada. Dr Manz has trailed many organization on the design, construction, installation, operation and maintaince of the BioSand filter. The Biosand filter (BSF) is an adaptation of the traditional slow sand filter, which has been used for community water treatmement for alomost 200 hundered years. The BSF is smaller and adapted for Intermittent use, making it suitable for households. The BSF can be used with any water source such as rainwater, deep groundwater, shallow groundwater, rivers, lakes or other surface water...

Contaminated water is simply poured into the top of the BioSand Filter on an intermittent basis. The water slowly passes through the diffuser and percolates down through the bioayer, sand gravel.Treated water naturally flows from the outlet tube. Pathogens and suspended solids are removed through a combination of biological and physical process that take place in the biolayer and within the sand layer. These processes include: mechanical trapping, predation, adsorption, and natural death. The biolayer is the key component of the filter that removes pathogens. Without it, the filter removes about 30-70% of the pathogens through mechanical trapping and adsorption. The ideal biolayer will increase will increase treatment efficiency up to 99% removal of pathogens. It may take up to 30 days for the biolayer to be fully formed. During that time, both the removal efficiency and the oxygen demand will increase as the biolayer grows..

January Project Launched
Biosand Filter Fabricated
Biosand Filter Installed
Villages Reached