Freshwater Silver Ion Cartridge
Auto-Ship Hot Tub
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.
Sign-up for our Auto-Ship Program and have a new cartridge automatically shipped to you for FREE via US mail every four months! All you pay for is the cartridge plus tax (where applicable!) 
Download and submit the Auto-Ship Form here!
*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.