Since 1992 divers have been a part of keeping water tanks clean in Texas. Divers are washed down with a 200ppm chlorine solution using gear that is purchased for and only used in potable water. No part of the divers body touches the water. Using a specially equipped pump or air lift system they are then able to remove the sediment from the floor of the tank. This is the most effective way to clean a potable water storage tank because it removes sediment that can be a habitat for bacteria and other contaminants. Everything that is loose is removed without damage to painted surfaces. This allows the chlorine in the system to more effectively do its job.