Pentair Rainbow Cyanuric Acid reagent in one gallon size. This replacement reagent in the one gallon size is used in Pentair/Rainbow testing kits and can be used to refill smaller bottles of Cyanuric Acid.
One of the most common chemicals used for the prevention of chlorine loss in swimming pools is Cyanuric Acid (also called CYA, Conditioner, or Stabilizer); it protects the free chlorine from being destroyed by the sun ultraviolet rays. If cyanuric acid is present in the water in sufficient levels, less chlorine degradation occurs. Keeping chlorine in the water longer will help to protect the swimmers in the pool.
