As the name suggests, ELECTRICAL CONDUCTIVITY indicates the ability of a material or substance to transmit electrical current. In water, the dissolved salts or ions are responsible for this, so the conductivity is a good indicator of the amount of salts dissolved in the water. However, this does not automatically mean that ultrapure water, from which all salts have been removed, is no longer conductive: Since the water molecules can also react with themselves (self-dissociation), even high-purity water still has a resistance of around 0.056 μS/cm.