【Enjoy The Natural Spa Experience】 The hot tub silver ion mineral stick can automatically add minerals to the hot springs. These spa hot tub mineral stick can effectively reduce the usage amount of chemicals. Making you feel as comfortable as you are in a natural spa! 【Applicable to Most Model】Our mineral cartridge for hot tub for use with existing hot tub systems, designed for use with most spa and hot tub systems. The minimum required is about 6.9 inches, and the minimum hole diameter is 1.8 inches. 【Extend the Life of Spa Water.】 This hot tub mineral cartridge for hot springs spa can extend the life of the spa water, keep your spa sparkling clean up to 4 months. You can enjoy your relaxing spa experience with a mind at ease. 【Exist for High-cost Performance】This hot springs silver ion stick is based on a product that was born through market research and customer needs. It has a maintenance time of up to 4 months, and the maintenance cost is extremely low. It can be used in conjunction with your existing hot tub systems. Just put your hot tub stick in the hot tub systems. You can enjoy a carefree spa experience for 4 months! 【Quickly Complete The Installation】This hot springs silver ion cartridge is equipped with a complete manual. The installation can be completed quickly according to the steps of the manual and is not affected by heat. It can be installed at the existing hot tub system. Just put the hydrotherapy rod into the existing hot tub system, and then let the hot tub stick work. These replacement parts are easy to install.