FROG @Ease in-Line SmartChlor Replacement Cartridge 3 Pack + 3 Packets of FROG Maintain:

For use only in certain hot tub models: Artesian Elite, Artesian Island (optional on Artesian Island Elite and South Seas); Marquis Crown (optional on Marquis Elite, Vector and Celebrity); Caldera Vacanza; and Hot Spring Hot Spot and hot tubs up to 600 gallons.
Bundle includes 3 FROG @ease SmartChlor Cartridges; each Cartridge lasts up to 4 weeks depending upon hot tub size and use, and 3 single dose FROG Maintain non-chlorine shock packets
Use the FROG SmartChlor Cartridge with the FROG @ease In-Line Mineral Cartridge (sold separately). FROG @ease Cartridges are prefilled for no mess, no guess and no stress. The FROG @ease system combines the proven FROG mineral formula with SmartChlor Technology
Kills bacteria 2 ways with FROG Sanitizing Minerals that kill bacteria and SmartChlor – a unique, patented chlorine that self-regulates and maintains a consistent low Free Chlorine level. Say goodbye to constant monitoring
You use up to 75% less chlorine* with FROG @ease, making water easier on skin, hair, swimsuits, and your hot tub’s surfaces. FROG sanitizing minerals condition the water for softness and absorb acid to help keep pH balanced
Shock only once a month with FROG Maintain, the recommended non-chlorine shock. With no chlorine, there is no Cyanuric Acid buildup that causes hard-to-manage, irritating water and frequent draining and refilling