The Unicel C-4316 spa filter has a non-standard 1-9/10 inch hole on the bottom which is primarily used in the ST-230 model hot tub made by SplashTubs.
Filter details:
- Unicel P/N: C-4316
- Diameter: 4-15/16"
- Length: 5-1/2"
- Top: Handle
- Bottom: 1-9/10" Open
- Media: 16 sq.ft.
- Filter Media: 3oz Reemay
- Pleat count: 177
Compatible replacement for:
- Filbur FC-3130
