Unicel 5CH-502 Replacement Filter Cartridge for 50 Square Foot Marquis Spas, New Style, Cal Spas
50 Square Foot Marquis Spas (new style), Cal Spas. Note: Unicel part number was formerly C-5303. Replacement for: Marquis Spas 20041 (Note: New design. Unicel part number was formally C-5303.); Unicel 50 Square Foot top load (Note: Replacement for Marquis Spas. Unicel part number was formerly C-5303.); Marquis Spas 370-0237 (Note: New design. Unicel part number was formally C-5303.); Cal Spas