McCaysville, GA was faced with a dilemma at their water treatment facility. Deteriorating performance was traced to failing filter underdrains. Due to the production demands placed upon the facility, there was little time available for remedial action before hot weather caused water usage to spike. - Rebuilding the filters presented a huge challenge because the McCaysville Water Treatment Plant could only afford to have a filter off line for a maximum of one week to effect corrective action. - This presentation outlines how the designer, treatment plant staff, contractor, and underdrain manufacturer came together to get the job done despite some significant challenges, both expected and unanticipated.