Water is a nearly colorless and odorless liquid and is vital for all known forms of life. It is the main constituent of oceans, rivers and lakes, and consists of two hydrogen atoms  and an oxygen atom connected by covalent bonds.

Water is  a commonly used medium for hydrostatic tests due to its low costs and easy availability. It is used in many high pressure testing applications for leak testing as it is usually harmless to the system to be tested. To make leaks easier to see, often a red or fluorescent dye is added to the water. 

 

Resato's experience with Water Testing in the Automotive Industry