HIGH QUALITY MATERIAL Our spa mineral sticks are made of high quality and healthy ABS material, odorless and fine workmanship. Drops directly 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 spa mineral filter's multi-layer filtration makes the water healthier and can effectively filter out a variety of impurities, keeping the spa water in good quality and keeping your tub 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 practical parts to be replaced in time. (Recommended to replace it once every 3-4 months.) LOW MAINTENANCE With our spa filter cartridge, can provide up to 4 months service for your spa filter, and the maintenance cost is extremely low, helpful to save your time and cost, you won't have to check or change it for the next four months. the easiest to use Italian, outdoor pools, tubs, plunge pools and standard tubs.Package Size: 16 x 7 x 5cm Note: The data is all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.