New set of 14 videos on Biosand Filter construction:

https://www.biosandfilters.info/updates/biosand-filter-construction-video-series

  1. Preparing Construction Materials
  2. Mechanical Sand Screening
  3. Steel Mold Properties
  4. Preparing the Mold
  5. Mixing the Concrete
  6. Pouring the Concrete Filter
  7. Pouring the Filter with Wet and Dry Concrete Mixes
  8. Demolding the Filter
  9. Quality Check and Curing the Concrete Filter
  10. Demold and Check Wet and Dry Concrete Mix Filters
  11. Wash that Sand
  12. Wash Separation and Drainage Gravel
  13. Installing a Concrete Container
  14. Installing Alternate Container