HIGH QUALITY MATERIAL Our spa mineral sticks are made of high quality and healthy ABS materials, odorless and with fine workmanship. Directly drops into the spa filter, keeps the water fresh and clear for a long time, brings you a natural and healthy spa. EXCELLENT FILTRATION SYSTEM The multi-layer filtration of the spa mineral filter makes the water healthier and can effectively filter a variety of impurities, keeping the spa water in good quality and keeping your bathtub clean. EASY TO USE AND REPLACE Simply place the mineral stick parts into your spa filter or skimmer basket and let them do their job, no other complicated process is needed. 2 pieces convenient for you to replace in time. (Recommended to replace it once every 3-4 months.) LOW MAINTENANCE With our spa filter cartridge, can provide up to 4 months of service for your spa filter, and the maintenance cost is extremely low, helpful to save your time and cost, you will not have to check or change it for the next four months. WIDELY APPLICABLE These spa cartridges are suitable for most spas and hot tubs, also compatible with inflatable spas, hot tubs, walk-in tubs, outdoor pools, baths, plunge pools and standard bathtubs, easiest to use.