Calcium hypochlorite. Rice grain-sized granules, 2kg (2kg x 1 bag) Food additive. Contains 70% available chlorine and exhibits powerful effects in sterilization, bleaching, and deodorization. ◇ Typical Uses: Sterilization and disinfection of swimming pools. ◇ Main Effects: A fast-acting granular agent. Suitable for pre-pool preparation and for quickly increasing the free residual chlorine level during pool use. Also suitable for carefully managing free residual chlorine levels. ◇ For Bathtub Water Management ◇ Convenient for removing algae in open-air baths, etc. (If sprinkled by hand directly onto algae, the algae will be bleached.) For high-concentration chlorine disinfection in day-trip facilities, it is recommended to throw in by hand and circulate overnight. ※ We have multiple items in stock, so if you want to purchase multiple units, please be sure to comment before purchasing.