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Jeff Adams, superintendent of the Cullman (Alabama) Wastewater Treatment Plant, with the modified primary trickling filter in the background.
From May through October, trickling filter flies (Psychoda alternata) and odors plagued the Cullman (Alabama) Wastewater Treatment Plant and residents of a 50-home subdivision across the fence line.
At a January 2019 City Council meeting, homeowners said mild and intermittent...
