GRIT BASICS: Regional Grit Particle Data
Your region determines what type of grit you'll find in your waste stream.

The Findings
In 2010, GritTech and Smith & Loveless in association with CH2MHIll, performed a comprehensive study comparing grit characterization profiles of 70 full-scale certified WWTP grit tests conducted across all domestic sectors with established U.S. Geological Survey river bed-sediment data. The results of the WEFTEC paper concluded the following:

1) Seventy-four (74%) of all incoming WWTP grit was at least 300 microns and larger, and more than 85% was 150 microns and larger.1

2) The regional influent grit profile strongly correlates to USGS regional river bed-sediment data, demonstrating less than five percent variance between the influent 300 micron particle compositions with the corresponding regional river bed-sediment data. The correlation was closely demonstrated in seven of eight regions; only the Midwest region showed a higher variance (13.8%). Thus regional sediment data is predictive for influent grit samples.1

1 Rippon et. al.; Grit Characterization and the Impact on Grit Removal Systems, 2010 WEFTEC.

National Grit Composition
Micron / Mesh
Average %
300 / 50 80.64%
212 / 70 11.85%
149 / 100 7.51%
Next Topic: Grit Removal
Introducing the PISTA®

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With decades of grit science and experience drawn from more than 2,600 global grit removal system installations, Smith & Loveless delivers innovative solutions that effectively meet the needs of your plant over time.

Grit removal success starts with understanding how to manage flow velocity for superior removal efficiency, which is achieved through constant R&D, field experience, and forward-thinking engineering. Beyond that, because all systems are indeed different, one must analyze how purchase price, installation cost, energy use and utility cost will affect the value of the grit system investment.

American-made PISTA® Grit Removal Systems, with continued new developments from Smith & Loveless reign as the standard of excellence that all others attempt to emulate. With new products such as the PISTA® 360™ with V-FORCE BAFFLE™, OPTIFLOW 270™, the PISTA® VIO™ and PISTA®Works™, we prove once again that at Smith & Loveless, we do more than develop industry firsts. We build industry bests.


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