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Measuring the EC is essential in cannabis growing as it provides information on the mineral concentration of the nutrient solution, allowing to apply the fertilizers (minerals) accordingly and ensuring the proper development of plants.
A good starting point is knowing that the electrical conductivity of distilled water is 0. When the EC of a solution is high from the outset (over 0.6-0.7), you can use osmosis filters. But if the mineral content - and thus the EC - is low, the water won't be able to generate the conductivity needed for the nutrient solution, generally because of a deficiency of micronutrients such as calcium and magnesium, which you will have to add yourself in order to reactivate nutrient uptake in plants.
Testing the water before you start growing will also save you a lot of trouble, as it will give you detailed information on the composition of the irrigation water.
from: www.dinafem.org/en/blog/how-adjust-ec-cannabis-growing/