After a new water main is installed and pressure tested it should be:

• A. Flushed with clean water for 24 hours and put into service
• B. Filled with a solution of 25 ppm to 50 ppm of free chlorine for at least 24 hours prior to flushing
• C. Filled with clean water and allowed to sit for 5 days at full pressure before turning the water into the system
• D. Photographed so that mapping can be avoided until the system is complete

Answer: (B)