Filter 50258 (also referenced as Unicel 5CH-25 or Pleatco PMAX25P4) is primarily used in Maax Spas and Vita Spas

Compatible Spa Brands & Models Maax Spas: Select models including the M51, M61, and M71. Vita Spas: 2013 and newer models like Elegant, Intrigue, and Joli, as well as 2015 and newer Image and Voeux models. Other brands: Certain Freeflow Spas and compatible hot tub systems utilizing a 25 sq. ft. thread-bottom filter. Filter Specifications Diameter: 5 5/8 inches Length: 6 inches Top Style: Handle Bottom Style: 1 1/2-inch MPT (Male Pipe Thread) Filter Area: 25 sq. feet