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The condition of the fill and system water can have a marked effect on the corrosion potential. Water is a cheap and plentiful medium and is, therefore, the preferred liquid. Water isn't just water and water chemistry is very complex. It can be highly corrosive to steel and other metals if certain values such as pH and conductivity are unfavourable. There are different methods of achieving the right water chemistry. The water can be either conditioned or chemically treated or both. There are many water treatment chemicals on the market. Chemical dosing can be beneficial under certain circumstances. However, it should be viewed like medication and only used to fight very specific problems. A healthy system does not need any chemical additives. If problems occur it is always better to find out the causes and rectify them before resourcing to chemical dosing.