Filter media having generally tetrahedral shaped flow channels is described. The filter media is generally formed by a flat filter sheet and a formed sheet. The formed sheet may be formed by a curves and/or pleats in the sheet. The curves and/or pleats form the tetrahedron channels. Embossments, such as dimples, are provided on the crests formed by the curves and/or pleats. The embossments help to maintain spacing between adjacent layers of the filter media, thereby increasing dust holding capacity and decreasing pressure drop over similarly configured filter media not having the embossments.