Enjoy Natural and Healthy Water: Spa mineral ion cartridge sticks can make a difference to your hot spring that you can see, smell and feel, bring you clean and clear water and reduce the use of chemicals. Gentle to Your Skin: Spa mineral ion cartridge sticks with 4 types of natural mineral filter balls and silver ion spa mineral cartridge Ag+ sticks can make the water mild and skin - friendly, bringing you a healthy and relaxing spa experience. High-Efficiency Filtration and Cleaning: Spa mineral ion cartridge sticks with an adequate amount of activated carbon and silver ions inside, it can efficiently adsorb and clean impurities in the water, remove odors, reduce water hardness, and enhance your spa experience. Long Lifespan and Low Maintenance: Single spa mineral ion cartridge sticks can work for 4 months and clean 500 gallons of hot spring water for you, avoiding the need for you to replace the filter cartridge frequently and saving you time and cost. Mixed Combination and Easy to Use: This mixed combination helps solve your dilemma of making a choice and provides you with more options for combinations. Both spa mineral ion cartridge sticks are universal and suitable for most hot tubs. Along with Silver Ion Spa Mineral Cartridge Ag+ Sticks come two detailed instruction manuals, which will guide you in detail on how to install and use these two filter cartridges, bringing you a better experience. BFJOG Hot tub mineral ion stick, spa mineral sticks for hot tub replacements brings natural and healthy spring water to you lasts for 4 months and is capable of treating 500 gallons of water.