Nitori Humidifier Silver Ion Stick 1 stick x 3 Safe disinfection with the power of silver ions Suppresses the growth of bacteria and prevents slime! Long-lasting and economical! One stick lasts for one season Easy and hassle-free Simply put it in the tank to create silver ion disinfected water. Cannot be used in tanks with a water inlet diameter of 23mm or less. MADE IN JAPAN Yu-packet Post Delivered by post.