Package includes 4 filters for use with the PUR 2-Stage Water Pitcher and Dispenser Reduces lead, 99.9 percent of microbiological cysts, and over 96% trace levels of pharmaceuticals while retaining beneficial fluoride 2-Stage design with activated carbon microfilter layer to reduce contaminants and a layer to trap sediment Single filter provides up to 40 gallons (1 to 2 months) of clean water and should be replaced after this period