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Whether it's colored or not, pervious concrete acts as a natural filter to keep pollutants from contaminating our water sources.

Still, pervious concrete can be attractive when integrated into an overall project design. As more concrete contractors gain experience with the material, pervious concrete is gaining acceptance in visually sensitive projects where color is an important element of the hardscape design.

The author is a freelance writer based in Tarzana, Calif., specializing in concrete and construction topics. Visit the Web site, www.chusid.com.