zip. I've felt the ChemGro as mixed with Cal and Mag is essentially a 1-1-2 nutrient, thanks for breaking that down.
With new mix and only a 90-120 day cycle, I'm betting salt and fertilizer build-up is much less a problem than I had first considered last year, even considering my excessive evaporation. Hand-mixed and watered once daily, and fed constantly but at a slightly reduced rate. I'm running an EC 1.8 mmhos from the recommended 2.0
With me it's all visual, and I lean heavily on trial and error. Mileage may vary.
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