These paper filters work with our Chemex 3 cup glass coffee jug. Just fold and place in the jug, then add ground Cloud Picker coffee and hot water for your morning coffee. Chemex Bonded Filters for the 1-3 cup brewer. 100 pieces Chemex filters are 20–30% heavier than standard paper filters. They are a perfect fit for the chemex 3 cup brewer and their density allows for ideal brewing and extraction times.