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 

  First posting 2007-08-13
  Page last updated 2022-02-02






Illustrations of sand sizes large view


sand size examples

Sand size examples
The "uc < 2" means: Uniformity coefficient of less than 2. The uniformity coefficient is a way of expressing the quality of a particular volume of sand. A smaller number means the grains are nearly all the same size; whereas a larger number means the grains of sand are all very different sizes. A larger number for the UC of sand means the sand is less desirable for water filtration. A UC of less than 2 is generally the best. The "effective size" means, in this case, the "average" size of the grains of sand in the given sample as they relate to water filtration.


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