The porosity and material of the filter used in drip brewing have a significant impact on coffee quality. Filter porosity also determines the amount of insoluble that passes into the brewed coffee. Insoluble material increases the body of coffee but can dull acidity and muddle flavor.
a) Metal filters produce coffee with a great deal of body and poor flavor clarity
b) Cloth filters produce coffee with a lot of body and moderate flavor clarity
c) Paper filters produce coffee with the least body and most flavor clarity