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Using the results of years of research, BUNN manufactures filters from high quality, heavy weight paper, so the water flows properly through the coffee. BUNN filters are uniquely designed for strength, using taller side walls, minimizing overflow and grounds in your coffee. Bun's paper stock used in the manufacturing of our coffee filters is produced using an elemental chlorine-free (ECF) whitening method. This process insures that there will be no detectable level of dioxin in Bun's paper coffee filters. Our paper stock supplier conducts regular testing, as required by the Environmental Protection Agency (EPA), to confirm that no detectable dioxin is present.