http://nseej.com/رسائل/-104069/ Commonly known as the cause of Legionnaire�s Disease, legionella is often found naturally in freshwater ponds and creeks. However, the bacteria can also reside in many types of domestic water sources, including cooling towers, hot water heaters, air-conditioning systems, shower heads and spas. Sat, 06 Apr 2013 16:37:59 UTC en