The Intermittently Discharged Extended Aeration Lagoon (IDEAL) from Environmental Dynamics International combines extended aeration with batch treatment to effectively remove ammonia and a significant portion of nitrate/nitrite in an earthen basin. It was tested through the winter of 2013-14 for a variety of common pollutants (i.e., BOD, TSS, ammonia, etc.), and consistently demonstrated the ability to remove high amounts of BOD, TSS, and ammonia-nitrogen, with 66 percent total nitrogen removal, at liquor temperatures less than 3 degrees C. 877/334-2478; www.lagoon-solutions.com.