The American Spas 50 R is a compatible replacement for the following pool filter cartridges:
The American Spas 50 Sq. Ft. Comp. Pool and Spa Filter reduces contaminants in swimming pool and spa water while also improving clarity. This compatible American Spas pool filter measures 4 15/16" x 13 5/16" and has 2 1/8" Open top/bottom styles. This pool water filter also offers 50 square feet of media area for cleaner and fresher water.