35 sq ft filter for the Marquis e-Series and Celebrity range of hot tubs which includes the e-Series 322, 425, 435, 524, 545, 660 and 750. Also older models of the Celebrity Hollywood, Broadway, Vegas and Napa. Note: Please compare measurements before ordered to ensure the correct match.
50 sq foot filter fits a range of hot tubs including hot tubs supplied by The Tub Company including Spa Crest Duke, King, Queen, Knight, Marcus and Duchess. Vision Hydrus, Gemini, Aquarius, Pheonix, Delphi, Cygnus and Pisces hot tubs.