The Rainbow 817-3510 R is a compatible replacement for the following pool filter cartridges:
The Rainbow 817-3510 Comp. Pool & Spa Filter Cartridge is a spa filter replacement that efficiently purifies your swimming pool and spa water through a combination of premium media and 35 sq. ft. of area. This compatible Rainbow filter offers dimensions of 4 15/16" x 4 5/8" and 2 1/8" Open top/bottom styles.