Pool Mate 16-Pounds Premium Pool Stabilizer and Conditioner, Concentrated Cyanuric Acid for Pools, Helps Chlorine Last Longer

Cyanuric acid for poolsHelps reduce chlorine lossRecommended cyanuric acid level is 40-100 ppm6 ounces raises cyanuric acid level 10 ppm per 5,000 gallons of waterIncreases cyanuric acid level