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Athena - PPM stands for parts per million & is the most common domestically used unit when measuring TDS. EC stands for electrical conductivity, which is a measurement of the ability of
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Need help with getting the correct amount of ppms for my plants.
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EC to PPM Conversion
הידרוגארדן - הידרופדיה: ערכי מדידה לגידול הידרו
electrical conductivity measurements
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