View from inside filter plenum during installation of new filter underdrain system Foothill WTP Filter Upgrade Project, City of Redding, Redding CA The City of Redding operates the 28- mgd Foothill WTP treating surface water from the Sacramento River using conventional ?ltration and chlorine disinfection. The plant began experiencing blow-through of ?lter media in 2007 and was in need of immediate replacement of ?lter blocks and media. Additionally, the existing air scour system had been ine?ective at providing adequate cleaning of the media during backwash. The existing air scour system was a passive air/water underdrain system which routed air through the ?lter plenum and through the ?lter blocks during a backwash. A new dedicated air scour system was installed (Aries Managed Air System)

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