WIDE COMPATIBILITY: This spa stick mineral cartridge reduces bromine and chlorine use in your spa, makes spa water more clear and soft. It is compatible with vessel that are 7"+L with a hole diameter of 1½"+ and serves as an alternative for Nature2 and for Jacuzzi ProClear Hot Tub & Spa system. The ends can be cut appropriately to suitable more filters. INNOVATIVE DESIGN FOR ENHANCED CIRCULATION: The spa stick mineral cartridge features a unique design that draws water through the cap openings and scooped louvers at the top, circulating it through the mineral formula and releasing it through the bottom openings. Enhancing water clarity and helping maintain a neutral pH balance. This results in softer water and a more enjoyable spa experience. REDUCED BROMINE & CHLORINE USE: This spa stick mineral cartridge reduces the use of chlorine and bromine in your spa water and keeps it clean and fresh. It ensures superior water quality while reducing chemical use by up to 50%, making it an efficient mineral system for hot tubs & spas. LONG-LASTING & CONVENIENT: The spa stick mineral cartridge lasts up to 4 months, with a built-in reminder dial that makes it easy to track when replacement is needed, ensuring effortless maintenance. EASY INSTALLATION: Designed to fit perfectly within your hot tub & spa's system, the mineral stick simplifies spa upkeep, a mineral cartridge stick easily fits into the vessel, ensuring your hot tub experience remains enjoyable and stress-free. This spa stick mineral cartridge uses less bromine and chlorine, the spa mineral cartridge stick helps clear spa water. It is compatible with vessel that are 7"+L with a hole diameter of 1½"+ and serves as an alternative for Nature2 and for Jacuzzi ProClear Hot Tub & Spa system.