FLTR PUR 20138 Style Filters are designed for use with Bunn gourmet size funnel Coffee brewers that use flat bottom style filters. 

Water follows the path of least resistance. Most coffee filters are made of randomly pressed fibers, creating weak spots. Water is drawn through those weaker areas first, leaving unsaturated grounds and varied extraction. FLTR PUR’s premium filters have universal material thickness, resulting in consistent extraction. They cleanly remove bitter oils and fines without imparting any flavor. Only the best of the coffee makes it into the cup!