Three lab scale dual media columns filtering synthetic raw water were monitored for dissolved organic carbon removal under nutrient limited (nitrogen, phosphorous deficient) and nutrient enhanced (nitrogen, phosphorous supplementation) conditions. The effects of different types of backwash procedures was also observed. Overall, nitrogen and phosphorous enhancement improved DOC removals by 14% - 18.5%. As well, the addition of air scour to the backwash procedure increased DOC removal by 8% for the nutrient limited control column. Besides nitrogen and phosphorous, the effects of potassium addition were also studied. Potassium enhancement did not improve DOC removal but an increase in phospholipid biomass values was observed. Following this increase, a biomass sloughing event was observed that may have been a result of the potassium enhancement. No clear correlations could be drawn between biomass phospholipid or ATP values and DOC removal.