The spa mineral rod is made of high-quality and healthy ABS material, odorless, and finely crafted. Directly falling into the spa filter, keeping the water fresh and clear for a long time, bringing you a natural and healthy spa. Excellent filtration system: The multi-layer filtration of mineral filters in hydrotherapy makes water healthier and effectively filters out various impurities, maintaining the good quality of hydrotherapy water and keeping the bathtub clean. Easy to use and replace, simply place the parts of the mineral rod in the spa filter or skim basket to complete their work, without the need for other complex processes. Two practical components need to be replaced in a timely manner. (It is recommended to replace it every 3-4 months.) Low maintenance use of our spa filter cartridge can provide up to 4 months of service for your spa filter, and the maintenance cost is extremely low, which helps save you time and costs. You don't need to inspect or replace it in the next four months. Widely applicable to most spa centers and hot tubs, it is also compatible with inflatable spa centers, hot tubs, walk-in tubs, outdoor swimming pools, bathtubs, diving pools, and the easiest to use standard bathtubs.