Clorox Pool&Spa Shock Plus clears cloudy water in your pool with its four-in-one formula. Shock Plus doesn t impact pH and is fast dissolving so you can swim in as little as 15 minutes. (Refer to the re-entry statement on the back panel for further guidance). 4 in 1 Formula: Clears cloudy water removes organic contaminants; reduces chlorine odor; improves filter performance; won t impact pH. Test and balance water prior to use. Adjust pH to 7.2-7.6 and free chlorine to 1-4 ppm.