Sand Filters

A slow sand filter is a sand filter adapted for household use. Please note that although commonly referred to as the BioSand FilterExternal, the BioSand Filter terminology is trademarked to one particular design.

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Benefits of Sand Filters

Slow sand filter lab effectiveness studies with a mature biolayer have shown 99.98% protozoan, 90-99% bacterial, and variable viral reduction. Field effectiveness studies have documented E. coli removal rates of 80-98%. Two health impact studies report 44-47% reduction of diarrheal disease incidence in users.

  • Proven reduction of protozoa and most bacteria
  • High flow rate of up to 0.6 liters per minute
  • Simplicity of use and acceptability
  • Visual improvement of the water

The average slow sand filter's construction cost ranges from US $15-$60, depending on whether local or imported materials are used. Filter programs are either fully subsidized or operated at partial cost recovery (with users paying $2-$10) using donor funds.

Frequently Asked Questions

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