Eco Pur Mineral Filter used in all Master Spas hot tubs and swim spas
Twilight and Michael Phelps Legend Series *Does not include Twilight 240*
Outer locking filter used With Eco Pur in Twilight and Michael Phelps Legend series
Outer locking filter used With Eco Pur in Healthy Living, Clarity and Twilight 240
Solid Filter used in Nordic Spas, Clarity Spas, and Healthy Living Spas
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