Unicel Replacement Cartridge, 50 Sq. Ft., 5-3/16" x 12-1/2" (5CH502)

Formerly C-5303 - 5CH-502 filter cartridges ensures your water stays clear so you can enjoy relaxing in your spa or hot tub - Features 50 square feet (197 pleats) of 3-ounce basis weight media that catches debris and particles down to an average of 20 microns in size - Sharp, uniform pleat folds maximize water flow, minimize pressure loss, and allow full use of the pleat surface to hold more debris - Constructed with 100-percent polyester Reemay material that balances dirt-holding capacity, cleanability and durability with excellent chemical resistance properties - Design includes a 2-inch male thread/MPT and a bar handle for easy cartridge removal and replacement - Durable end caps resist damage from chemicals and assure durability for the life of the cartridge - Compatible with Marquis Spas and Cal Spas - Filter life depends on routine maintenance and spa water chemistry - Change filter when there is a shorter cycle between cleaning, low water flow rate or high differential pressure, when the media has a tear, or if the center core collapses