The HOTSPRING HOTUB SPA 10 Inches Hot Tub Mineral Ion Cartridge Stick 2 pk is a filter cartridge specifically designed for hot tubs. Made by the brand HOTSPRING HOTUB, this 10-inch cartridge stick comes in a pack of 2 and is suitable for use in hot tubs. With its mineral ion technology, this product helps to clean and purify the water in hot tubs, providing a refreshing and rejuvenating experience for users. Made in China, this cartridge stick is a convenient and essential accessory for maintaining the cleanliness and functionality of your hot tub.