3.Exist for High-cost Performance: It has a maintenance time of up to 4 months, and the maintenance cost is extremely low. It can be used in conjunction with your existing filter. Just put your hot tub stick in the filter. You can enjoy a carefree spa experience for 4 months! 1.Natural Spa Experience: The nature spa mineral stick can automatically add to the hot springs, reducing impurities in the hot springs to create clearer and cleaner water, making you feel as comfortable as you are in a ! 2.Extend Life: This mineral stick can extend the life of spa, keep the crystal clean, keep your spa sparkling clean and fragrant, and make the guest's spa experience unparalleled! 4.Easy to Install: The installation can be completed quickly according to the steps of the manual and is not affected by heat. It can be installed at the existing flow rate. Just put the hydrotherapy rod into the existing filter, and then Let the hot tub stick work.