Freshwater Silver Ion Cartridge
Insert the silver ion cartridge into the filter of your hot tub and the silver ions are released automatically reducing your need for chlorine! Simply replace your cartridge every 3-4 months.

*This Silver Ion Cartridge fits into the main filter of your Hot Spring Spa. It also works with Caldera Spas. Find the Sun Purity Silver Ion Cartridge for Sundance Spas here.