currently unavailable see factory recommended 12 inch filter 74455

Saratoga Spa Filter 74457 16 1/2 x 4 3/4 inches made by Pleatco for Saratoga Spas.

Factory is phasing these 16 1/2 inch long filters out and replacing them with the shorter 12 inch filters 74455

Original microban Saratoga Spa filter with slotted bottom.

Luxury series.  Has 2 slots in bottom that can accommodate threaded adapter located in the spa's filter housing floor, and has a handle on the top.

Broadway and Empire spas.

Saratoga Spa Filter 74457

This filter type has a keyhole type opening on bottom that fits the filter adapter in the bottom of the Saratoga Spa filter housing.

Or can remove the filter adapter and use the filter with bottom threads FC-0133M