What is water conductivity

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In simple language, water conductivity is a measure of the water's ability to conduct electricity.

Conductivity is a measure of water’s capability to pass electrical flow, measured in microsiemens per centimetre.
This is directly related to the concentration of minerals in the water.
The more dissolved salts and inorganic materials, the higher the conductivity of water.
Distilled or deionized water has virtually no conductivity, virtually zero microsiemens per centimetre.
Sea water, on the other hand, has a very high conductivity 55,000 microsiemens per centimetre,
 
Conductivity is an indicator of the amount of essential minerals for the survival and healthy growth of fish.
That is usually referred to as the hardness of water.
If your water has little or no conductivity, then it is probably bad for fish. See why here
And this pagefor subscribers to the members area of this website to see how this affects commercial production..

Virtually all dissolved substances will affect conductivity.
Measuring conductivity is not a reliable way to measure salt.
Salt is measures with a salt refractometer, seen below.
pH affects conductivity.
pH is best measured with a pH meter, see below,.
Some pH meters also measure conductivity. 
Below is a salt refractometer more here
Salt refractometer viewing
Below is a conductivity meter
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The pH meter below also measures conductivity  more here
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More here

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