The Wood Mold we've engineered is an innovative technology that makes it cheaper, faster, and easier to provide safe drinking water to families.  

Our award winning Wood Mold allows local organizations to manufacture concrete BioSand Filters for a fraction of the upfront costs of traditional methods, meaning more people can get clean water faster.

Our award winning Wood Mold allows local organizations to manufacture concrete BioSand Filters for a fraction of the upfront costs of traditional methods, meaning more people can get clean water faster.

What’s a BioSand Filter? 

BioSand Filters (BSFs) use sand, gravel, and natural biological processes to filter out contaminants in water, making it safe for drinking. BSFs effectively eliminate cholera, typhoid, E coli, amoebic dysentery, and many additional pathogens that are harmful to humans. They’re a great low-tech drinking water solution.

  • Very effective at removing bacteria, protozoa, and helminths (parasitic worms) from water, and at reducing turbidity
  • Made with 100% locally available materials (unlike larger community based systems where foreign parts typically need to be imported)
  • Very durable, can last more than 20 years (if maintained properly)
  • Labor intensive NOT capital intensive to manufacture
  • No electricity or running parts required to operate the filter
  • Little maintenance required 
Ohorizons_Cement_BioSand_Filter
OHorizons BioSand Filter in a Bangladeshi Family's Home

OHorizons BioSand Filter in a Bangladeshi Family's Home

The traditional issue with concrete BSFs was that the Steel Mold used to produce them is expensive (between $500-2000) and requires an experienced welder to make. Many communities and local NGOs shared with us that they either didn't have the technical capacity or financial resources to start a BSF project. We listened and started exploring how to disrupt the concrete BioSand Filter manufacturing process.

Want to learn more about BioSand FiltersDownload our Introduction to BioSand Filters document to learn more about how BSFs work, their different components, and frequently asked questions. 


Our Wood Mold

The DIY Wood Mold we've engineered is an innovative technology that makes it cheaper, faster, and easier to produce concrete BioSand Filters. Because the Wood Mold is so inexpensive and easy to make, anyone, anywhere can bring clean water access to their community. You can find our Wood Mold Construction Manual and Appendix on our Resources Page. These step-by-step instructional documents are open-source and free to download. 

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Advantages of the Wood Mold

  • Inexpensive ($70-$100/mold including cost of labor)
  • Locally-Sourced Materials (all materials purchased in-country and easily replaced)
  • Easy to use (no special skills or previous construction experience necessary)
  • Durable (+50 filters/mold)
  • Can be made off-grid and on-location. (no electricity required) 
  • Rapidly increases filter production capacity. It can scale! (See infographic below) 
NOTE: This ratio includes the cost of labor to produce each mold. The numbers used are an average because the local cost of materials and labor vary based on location. An OHorizons Wood Mold costs between $70-100. A steel mold costs between $500-2000.  

NOTE: This ratio includes the cost of labor to produce each mold. The numbers used are an average because the local cost of materials and labor vary based on location. An OHorizons Wood Mold costs between $70-100. A steel mold costs between $500-2000.  

Making a BioSand Filter with the OHorizons Wood Mold

Step1: Construct and assemble the Wood Mold

Step2: Mix and pour concrete into the Mold, let it sit overnight

Step3: De-mold the BSF and prepare filter media

Step4: Install filter media and operate BSF
 

Are you ready for more in-depth video lessons on building our Wood Mold? Our DIY Instructional Video Series features 6 videos that provide supplementary visuals and explanations to the information laid out in our Wood Mold Construction Manual and Appendix. Start here... Parts of the OHorizons Wood Mold 

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