CDC guidelines recommend testing the chlorine level and pH of pool water at least twice per day, and more often during heavy use. As long as pool water is maintained at between 1 and 4 parts per million free chlorine and the pH between 7.0 and 7.8, most viruses will not survive in water. Keeping those values well within those acceptable ranges is the challenge for pool operators and backyard pool owners alike.
The following resource are from the CDC, ACC, and PHTA: