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







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:
http://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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