HIGH QUALITY MATERIAL Our spa mineral sticks are made of healthy and high quality ABS material, odorless and with 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 multi-layer filtration of the spa mineral filter makes the water healthier and can effectively filter a variety of chemicals. of impurities, keeping the spa water of good quality. and keeping your bathtub clean.EASY & Agrave; USING AND À REPLACE Simply place the mineral stick pieces into your spa filter or skimmer basket and let them do their thing, no other complicated process. is necessary. 2 practical rooms to be replace at 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 it or change it for the next four months.WIDELY APPLICABLE These spa cartridges are suitable for; most hot tubs and hot tubs whirlpool, also compatible with inflatable spas, jacuzzis, whirlpool tubs. Italian, outdoor pools, baths, plunge pools and standard tubs are the easiest to clean. use.