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Biosand Filters
Biosand Filters
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Catherine Francis
Senior advisor, marketing and communications, CAWST

Take the biosand filter survey

CAWST needs your input! In 2023, the biosand filter celebrates a very important milestone - 30 years. We invite all biosand filter implementers and/or trainers to participate in a survey to measure the tremendous impact the technology has had – on the WASH sector, and in people’s lives around the world. The survey includes questions about your experience with implementation, distribution, and impact, and how you have applied new knowledge, skills, and innovations. 
All results will be anonymized, so your answers won’t be attributed to you in our reports. The survey should take between 5 and 10 minutes to complete, and it's currently available in English, Spanish, French and Nepali. Please add a comment if you would prefer to take the survey in another language.
Take the survey now
Thanks for your participation!

Catherine Francis
Senior advisor, marketing and communications, CAWST

Take the biosand filter survey

CAWST needs your input! In 2023, the biosand filter celebrates a very important milestone - 30 years. We invite all biosand filter implementers and/or trainers to participate in a survey to measure the tremendous impact the technology has had – on the WASH sector, and in people’s lives around the world. The survey includes questions about your experience with implementation, distribution, and impact, and how you have applied new knowledge, skills, and innovations. 
All results will be anonymized, so your answers won’t be attributed to you in our reports. The survey should take between 5 and 10 minutes to complete, and it's currently available in English, Spanish, French and Nepali. Please add a comment if you would prefer to take the survey in another language.
Take the survey now
Thanks for your participation!

Biosand Diffuser

What alternate diffusers can you use in Cambodia instead of metal which will cause rusting which will cause the people not to use it? 

rusted biosand filter
rusted biosand filter

Origin Story of Biosand Filter Safe Water Social Venture Projects in South Sudan & Uganda

The safe water social venture (SWSV) projects commenced in South Sudan in January 2004.  If this is of interest, the link below contains the origin story.  The South Sudanese projects had to shut down in 2016 due to the civil war there.  The resilient team members were able to restart the projects in Uganda (TEDx talk in 2nd link below).  We are presently in the process of securing Gold Standard for the Global Goals carbon offsets for the Ugandan projects (due to the avoided need to boil water).  These will allow the Ugandan projects to scale up their impact and to restart the projects in South Sudan (hopefully next year)   

https://www.enviro-stewards.com/wp-content/uploads/2013/05/E-S-Safe-Water-Project-Backgrounder-1.pdf 

https://www.ted.com/talks/bruce_taylor_better_than_charity