I see recommendations talking about E.C., Cf, and ppm. What are they and what is the difference between them?

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I see recommendations talking about E.C., Cf, and ppm. What are they and what is the difference between them?

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A. In hydroponics, they are all measurements of the amount of dissolved salts in your nutrient solution. These measurements include all salts, whether fertilizer salts or non-nutrient salts already in the water such as common salt. These salts are commonly referred to as the ‘background conductivity’ of your water and can be measured using a conductivity meter (see 11.).

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