The Sundance 6540-497 R is a compatible replacement for the following pool filter cartridges:
The Sundance Spas 6540-497 Comp. Spa Filter Cartridge is a spa filter replacement constructed with 50 sq. ft. of media area for the reduction of contaminants in swimming pool and spa water. This compatible Sundance Spas filter features 2 1/8" Open top & bottom holes and measures 4 15/16" x 14 7/8".