@Grower202085, please check my other reply, I am using calmag, just very little, maybe 0.2ml/L max, and I don't measure EC I measure ppm, it's at around 70 ppm at the tap like I said - that's with a European TDS meter so I'm not sure if you divide by 500 or 700 to get from ppm to EC, so about 0.1 to 0.14 I guess. Cheers!
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