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Illustrations
of sand sizes large view
 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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