NeutraFlush Gravity-Fed Eyewash Station Cleansing Stick uses Copper-Silver Ionization to deliver up to three years of protection against the growth of algae, fungi, Legionella, E-Coli and other pathogenic bacteria. It prevents the buildup of scale, biofilms and corrosion. Cleansing stick is environmentally friendly, using no chemicals to treat the water. Specially designed for use in portable emergency eyewash products, one stick cleanses up to 60L. Cleansing sticks are easy-to-use and simple to install.