Natural hot spring experience: The mineral bar can automatically add trace elements to hot spring or pool water, reducing impurities in the water and keeping the water clear. Premium Materials: This mineral purifier is built into the pool to keep the water fresh. Reduces the need for bromine and chlorine while providing powerful hygiene for your spa or hot tub. Easy to install: Simply place the mineral purifier into your existing equipment. Insert the assembled extension rod into the spa mineral sanitizer to complete the installation. Low cost maintenance: The spa mineral purification cartridge is suitable for 500 gallon / 2000L SPA and bath height hot tub and pool, lasts 3-4 months, low maintenance cost, enjoy clean water without worries Wide range of applications: The mineral stick adapts to most spas and hot tubs, and is suitable for swimming pools, walk-in tubs, hot tubs, alcove tubs, and most standard easy-to-use tubs.