The Salt System Replacement Cartridges are designed specifically for Hot Springs Spas, offering a 2 pack of cartridge filters with a maximum flow rate of 1000 GPH. These cartridges are compatible with Aqua Leader, Hot Springs, and Caldera brands, making them suitable for various spa models. The cartridges are salt water compatible and feature a compact design, measuring 7 inches in length and 2 inches in height. Made in China, these cartridges are essential for maintaining clean and clear water in your hot tub, ensuring a relaxing and rejuvenating experience.