The main advantage of this method is that it increases the speed of filtration by letting air enter the flask along its sides to bring about pressure equalization. In addition, the fluted filter paper has a larger surface area through which the solvent can seep.Why is a fluted filter paper used in gravity filtration?
Fluted filter paper is a circular piece of filter paper folded in an accordion style and used to filter solid impurities from a liquid during gravity filtration. The fluting of the paper increases the surface area of the filter. Filter paper is fluted by folding a circular piece in half three times without unfolding the paper between folds.