Dychlor II is 56% Self-Stabilized Sodium Dichloro granules used to kill bacteria & fungus, control algae & destroy the organic contaminants in water while leaving behind a beneficial chlorine residual for ongoing protection. Clears up hazy water. Ideal for use in vinyl liner & Salt Pool applications. Also used to ramp up Free Available Chlorine quickly when using Trichlor Tablets or Sticks as sanitizer.