HTH Granule Chlorine Stabilizer 4 lb (Pack of 4)HTH Pool Care Chlorine Stabilizer helps protect and extend the life of chlorine in your swimming pool water and ensures healthy swimming. For best results, use HTH 6 way test strips weekly to test, balance and maintain stabilizer levels between 20 and 25 ppm. UPC: 073187670618 Manufacturer Part No: 67061 Protects chlorine against sunlight Helps chlorine last longer Compatible with all swimming pools Simply add HTH chlorine stabilizer directly to your