Wastewater, or waste water as it is sometimes written, is water that has been used and undergone a reduction in quality from its original state. Wastewater can come from a variety of uses including commercial, industrial, domestic, farming and agricultural activities, storm-water or surface water runoff, and from sewer inflow or infiltration.
The cleaning, disinfection and chlorination of water systems is an essential activity that helps maintain good standards of water hygiene, especially in domestic water systems where microbial contamination can lead to serious problems. Cleaning and chlorination activities involve the addition of chlorine, a cost efficient but very effective disinfectant, to a water supply at a specific concentration, and for a specified period in order to clean and disinfect the water system, pipework and water tanks.