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The Splash 16 ST-315 R is a compatible replacement for the following spa filters:
The Splash Tub ST-315 Comp. Pool Filter - 16 Square Ft is a pool filter cartridge measuring 4 15/16" x 5 1/2" and featuring 16 square feet of media area. This compatible Splash Tub filter features a Closed Knob Handle top style and 1 9/10" Open bottom style with Slots.