- How to Measure your Hot Tub Filter
How to Measure your Hot Tub Filter
Use these instructions to measure your hot tub filter.
- Measure the outside diameter of the cartridge (in inches, +/- 1/32").
- Measure the cartridge length including end caps, but excluding any handles or other extensions. Measure through the centre if possible (in inches, +/- 1/16").
- Use the Filter End Cap Chart to identify your cartridge end cap configuration. If the top and/or bottom is "open," measure the inside diameter (in inches, +/- 1/32").