... tablet/effervescent tablet high purity high quality and best price chlorine dioxide tablet used for swimming pool(effervescent tablet)[Product Features ... ] Directly put it into waterswimming pool sanitizing, 200~400g tablet/40 ton water(pure chlorine dioxide: 0.5~1mg/L);add ... in water less than 0.05mg/L. Pls adjust the chlorine dioxide concentration according to actual water quality. [Cautions]1,The ...