Unicel C-6980-4 Quad DE Filter Cartridge Set 80 Sq FtKey Benefits + Fitment (Will This Work For Me?) Restores full 80 sq. ft. filtration capacity for Pentair Quad D. E. 80 filters Fits Pentair Quad D. E. 80 (Model 188593) full 4 pack replacement set Unicel C 6980 4 replacement cartridges (Replaces Pentair 178655) Designed for D. E. or D. E. alternative coating to achieve 35 micron water clarity Eliminates high PSI and restricted flow caused by oil blinded or debris loaded cartridges High density