HOW TO MEASURE YOUR POOL OR SPA CARTRIDGES
- Measure the outside diameter (OD) of the cartridge in inches.
- Measure the overall length of the replacement filter cartridge in inches including the end caps. Do not include any handles or threads on the bottom end cap. One of the best ways to measure a cartridge is through the center core with a tape measure when possible
- If the top or bottom end cap is open, measure the inner diameter (ID) of the holes in inches. In addition, make note of any markings on the end cap such as part number or manufacturer.
- Count the pleats and note if there is a core in the cartridge.