Purchased for 2000 yen. Only one tablet has been used, with 59 tablets remaining. The water has been changed each time, and since it's not being used, I'm selling it. Household pool chlorine disinfectant, 99.9% disinfection, no need to change water, for small and large pools, prevents dirt, slime, and odor, hypochlorous acid, chlorine disinfection, made in Japan, individually packaged, 60 tablets, NORAH