After completing disinfection in the plumbing. Must wash water chlorine out of line pipe?Until there is residual chlorine residual in water less than 1 mg/l.
After completion of the disinfection and water pipes. Must wash the chlorine out of the water pipe line until a chlorine residual in the water less than 1 milligram per liter.
After completing the disinfection of the contractor. To wash the chlorinated water out of the pipe line until the chlorine left residues in water less than 1 mg / L.