Includes 2 full pack of refills (good for 1 year of shower) Convenient and simple to refill, no need for professional plumber or tools Maifan stones – strong bactericidal effect, replenish necessary microelement for human, contains more beneficial mineral substance Alkaline Tourmaline ball- Naturally generate negative ions, which are known to enhance immune system Calcium Sulfite – Remove chlorine, filter water, chlorine removal rate reach 100%