Filters are the secret to the Chemex brewer. They are between 20 and 30 percent heavier than typical coffee filters, ensuring that all of the sludge is caught in the filtration process, which results in an extremely clean cup. In addition, the extra weight helps to ensure that the water is in contact with the coffee for the correct amount of time.

Each box contains 100 square folded filters and can be used for all Chemex brewers except the 3-Cup.