Final answer:
The acceptable level of free chlorine in swimming pool water is 1 to 3 ppm.
Step-by-step explanation:
The acceptable level of free chlorine in swimming pool water is 1 to 3 parts per million (ppm). This means that the concentration of chlorine in the water should be between 1 and 3 ppm. Chlorine is added to pool water to disinfect it and kill bacteria and other harmful microorganisms. Maintaining the proper chlorine level helps ensure clean and safe swimming pool water.