Final answer:
The acceptable level of free chlorine for a spa pool is between 1.5 ppm and 3.0 ppm.
Step-by-step explanation:
The acceptable level of free chlorine for a spa pool is between 1.5 ppm and 3.0 ppm. This ensures that the pool water is properly sanitized and safe for use. Levels below 1.5 ppm may not effectively kill bacteria and other harmful microorganisms, while levels above 3.0 ppm can cause skin and eye irritation.