This Replacement filter cartridge serves as the best replacement for Filbur# FC-3089, Pleatco# PTL50W-P and Unicel# C-6475. The technical specifications of the respective product are in compliance with OEM# C6475. The 14 ¾ inch long and 6 inch wide replacement filter cartridge has a semi-circular handle at the top and an open hole of 1 7/8 inch at the bottom. This respective product can be easily used in a 75 square feet Advanced Spa.