Use these as a starting frame, not a target. Soil feeds are often milder than coco or hydro, and some bigger coco runs push beyond 2.0 in peak bloom. Your tap water's own EC counts too: if it comes out at 0.4, that is already part of the total.
Watch the plant. Burnt tips and very dark leaves mean back off, pale new growth means room to go up. Also check which scale your meter uses, since EC and ppm are not the same number. Meters like the Platinum EC meter or the Aqua Master E50 Pro show it directly.
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