【HIGH-QUALITY MATERIAL】Our spa mineral rods are made of high-quality and healthy ABS material, are odorless and of fine workmanship. They fall directly into the spa filter, keeping the water fresh and clear for a long time and ensuring a natural and healthy spa. 【EXCELLENT FILTRATION SYSTEM】The multi-layer filtration of the spa mineral filter creates healthier water and can effectively filter out a variety of impurities, maintaining good spa water quality and keeping your bathtub clean. 【EASY TO USE AND REPLACE】Simply place the mineral rod pieces in your spa filter or skimmer basket and let them do their work; no other complicated operations are required. 2 practical parts that can be replaced over time. (It is recommended to replace it every 3-4 months.) Low Maintenance: With our spa filter cartridge, you can maintain your spa filter for up to 4 months, and the maintenance cost is extremely low, helpful for saving time and money. You don't need to check or change it for the next four