Usage Tips:1. Matching: Hayward Star Clear Plus C900/C9002 compatible with the pool filter. Hayward CX900re, Pleatco PA90/PA90-4, FILBUR FC-1292, Unicel C-8409 and more. The names and part numbers of all manufacturers are used only for compatibility information 2.NSF/ANSI 50 certified: Tested and certified by NSF International against NSF/ANSI 50 for the use of materials. Triple pleated design, 3x more than normal fabric catches, trap, hair, sand and oils efficiently for clean water Size: 8-15/16 ' with an inner diameter, 17-3/8 'height, because of your filter, you can easily fit into your filter. Permanent: C900 pool filter cartridge, spunbond polyester and a powerful inner core, which can withstand the high -pressure water flow and make it permanent enough to be a valuable investment for your pool Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store