Brita Pitcher Filters #OB03 Used in all Brita pitchers and water coolers. Replace every 40 gallons (approximately 2 months) for pitchers using one filter. For coolers using two filters, replace every 80 gallons (4 months). Reduces: Lead Mercury Benzene Toluene Tetrachloroethylene Zinc Chlorine Taste and Odor Changing filters: Wash hands with soap and water before removing the filter from the bag. Soak the new filter upright in cold water for 15 miutes. Hand wash your pitcher/dispenser, lid and resevoir with mild detergent. After soaking, rinse the filter under cold, running tap waterfor a few seconds. Insert into the resevoir by lining up the groove in the filter with the notch in the resevoir. Press firmly to ensure tight seal. It is normal and harmless for for carbon dust to appear in your first 2 pitchers. Discard this water or use it to water plants.