Hot tub manufacturers such as Cal Spas, Leisure Bay, Morgan, Jacuzzi Brothers, and Spa Manufacturers, as well as Baja and others, incorporate the Pentair Rainbow RTL-50, model R172504B, in their hot tubs. This top-load filter is specifically designed for portable spas. The main body of the filter is mounted in a niche under the spa shell, while the top is accessible from above the spa.
The complete filter assembly includes the following components with their respective part numbers:
Niche lock ring (secures the body to the niche): Part Number R172214
Lid lock ring (secures the lid): Part Number R172214
Push-down lever (to secure and release the lid lock ring): Part Number R172374
50 sq. ft. cartridge: Part Number R173434
Lid without a chemical feeder: Part Number R172385
