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Artesian Spas have made many different models of hot tubs over the years that use different size filters. The filter sizes can also vary within some of the same models based on age, number of pumps and amount of jets. When selecting a replacement filter for your hot tub model, it's best to measure your old filter and select a replacement filter with the same dimensions. Unicel, Pleatco and our house brands are excellent replacement filters that fit most Artesian Spas.