Preliminary studies suggested that freshwater algae accumulate relatively large concentrations of iron and manganese from acid mine drainage (AMD). A wetland was designed and constructed to treat a discharge from an abandoned deep mine to examine algae's ability to accumulate manganese under varying concentrations of iron. Dissolved manganese was found to decrease in the AMD at a greater rate than total manganese, indicating that algae and/or bacteria removed the dissolved manganese from the flows but were not retained in the wetland. A modification to the wetland allowed for an examination of the effects subsurface (aerobic) flows had on effluent quality, versus typical surface (aerobic) flows. This modication resulted in effluent quality that exhibited a ph greater than source values (>6.0), While maintaining alkalinity and decreasing acidity, and decreasing total iron concentrations by greater than 99 pct. These results occurred without the addition of an alkaline materials. Researchers should further examine the potential of subsurface flow designs and of systems that can physically precipitate or filter suspended manganese.