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Learn Facts About Grit

Grit consists of a variety of particles including sand, gravel and other heavy, discrete inorganic materials.

According to the United States Environmental Protection Agency’s Wastewater Technology Fact Sheet, “…grit is traditionally defined as particles larger than 0.21 mm (0.008 in.) (65 mesh) and with a specific gravity of greater than 2.65 (U.S. EPA, 1987)…”CLICK HERE FOR EPA FACT SHEET.

Most grit collected at WTTPs – nearly 90 percent on average – is larger than 70 mesh in size. In some coastal areas, smaller grit particles down to 100 mesh can be more common.


Sieve Mesh # Inches Microns Similarly-Sized Material
14 .0555 1400
28 .0280 700 Beach Sand
60 .0098 250 Fine Sand
100 .0059 150
200 .0029 74 Portland Cement