Ensure the purest water possible from your Waterwise Distiller with the Waterwise 3200 & 8800 Replacement Filter Pack of 6! These filters are meant to be replaced every two months, or after 60-80 gallons are processed. These carbon filter bags use post-filtration as a final treatment to effectively remove VOCs (volatile organic compounds). Each disposable carbon filter bag contains Granular Activated virgin Carbon (GAC) produced from coconut shell. High-temperature steam activation reorders the carbon atoms to produce an extremely porous structure with a much larger surface area. This network of very fine pores is extremely effective at trapping contaminant molecules, ensuring the purest water possible.