HTH Pool Stabilizer Granule works to prevent chlorine loss caused by intense sunlight, making it an essential addition for maintaining clean and clear water in pop-up pools. This completely soluble granular formula contains 98.5% cyanuric acid, which stabilizes chlorine levels effectively, while the remaining 1.5% consists of constituents that are ineffective as spray adjuvants. Conveniently packaged in a 4-pound bottle, this product is designed for easy use and reliable performance to help extend the life of your pool’s chlorine. Model Number: 67010