Unicel C-7490 Replacement Filter Cartridge | 137 sq. ft. | Hayward Super-Star-Clear C5500 / SwimClear C5520 DAPT2 add 1 fl oz for

add 1 fl oz for every 10

and 3 reusable & disposable pads

and fiberglass looking their stain-free best

48/56 Base Mounting

If your documentation shows part number 18219RO100 (with a letter O)

Unicel C-7490 Replacement Filter Cartridge | 137 sq. ft. | Hayward Super-Star-Clear C5500 / SwimClear C5520 DAPT2 add 1 fl oz forThe Unicel C 7490 is a 7000 Series 137 sq. ft. replacement filter cartridge engineered for precision fit in Hayward high capacity filter systems. Built with 4 oz. Reemay 2040 polyester media and 176 precision set pleats, this cartridge delivers exceptional debris capture, extended service intervals, and consistent flow all in an exact fit form factor that matches your Hayward OEM dimensions down to the millimeter. IMPORTANT: FOUR CARTRIDGES REQUIRED