Water in glass
Sustainable technology: A look at the design, construction and operation of a small scale slow sand water filter. (Building a small slow sand water filter for individual use)6
Please help support this site by purchasing, for seven dollars and fifty cents, a summary of the most important results of our research for the past 8 years, including detailed drawings of the filters, where to find sand, pictures, and an easy to understand faq of important considerations in the assembly of a small slow sand water filter. This page on our blog has the purchase area. Thank you!



 Introduction 
 Water Test Results 
 Water color improvement 
 Water clarity 
 Slow sand filter FAQ 
 Float Valve installed 
 First flush diverter 
 Illustrations and drawings 
> Sand size examples 
 Magnified sand size examples 
 Literature Cited 
 Slow Sand filter Blog
 Contact the author 

 Terms of Use / Copyright information 

  First posting 2008-08-13
  Page last updated 2022-02-01




Illustrations of sand sizes

sand size examples
Sand size examples   larger version (slow download - large file size)


The following website has listings of NSF certified sand suppliers and processing facilities:
https://www.nsf.org/Certified/Common/Company.asp?Standard=061 Two of the companies listed at this nsf.org site have supplied the sand used in the filters described in the study described on this website They are: MANUFACTURERS MINERAL COMPANY in Washington state    and Cemex in Californa. They are wholesale. You will need to find a hardware store, or building supplier near you to order products from them.

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