Grit Facts
 
We know grit and we know grit testing.

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, SEE PG. 7

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.

 

 

Grit Size Comparison Chart1

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
Actual Size

 
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