Measure the conductivity of the solution and therefore the ions available for plants uptake. However in aquaponics application EC values does not reflect the total available nutrients in the system as some nutrients are in organic forms and not free ions as in hydroponic solution. However, many still use EC Meter in aquaponics as it gives a reference value for increase and decrease of ions in the system as well as the temperature reading which is very crucial in aquaponics application.
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