http://www.biosandfilters.info
[Accessed: 26.02.2013]
Biosandfilters.info is a knowledge base: technical updates, case studies, evaluations, expert knowledge from over 10 years supporting hundreds of organisations implement biosand filter (BSF) projects. Biosandfilters.info was initiated to provide support to new and existing BSF implementers to succeed in their programs. Create a user login to enjoy full functionality of this website.