【HIGH QUALITY MATERIAL】Our spa mineral rods are made of high quality and healthy ABS material, no odor and fine workmanship. Drops directly into the spa filter, keeps water fresh and clear for a long time, providing a natural and healthy spa. 【EXCELLENT FILTRATION SYSTEM】The multi-layer filtration of the spa mineral filter makes water healthier and can effectively filter a variety of impurities, keeping the spa water of good quality and keeping your bathtub clean. 【EASY TO USE AND REPLACE】Just put the mineral rod parts in your spa filter or skimmer basket and let them do their job, no other complicated operations required. 2 convenient parts that can be replaced over time. (It is recommended to replace it every 3-4 months.) Low Maintenance: Our spa filter cartridge can maintain your spa filter for up to 4 months, and the maintenance cost is extremely low, helpful to save time and cost, you don't need to check or change it in the next four months. . [WIDE APPLICABILITY] These spa