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By Day 11, I try to aim for an EC of 1.1 by Day 22, 1.3 and then keep it at that for the entire cycle. If you think the plants can handle it, up this to 1.6-1.8max for the last three weeks of flower.Grodan rockwool starter blocks, inserted in 4" rock wool cubes, after having been soaked in distilled water with zero EC, pH-downed to 5.5, reads about 550 EC. Hmm. Start nutrient ramp ups from 550 EC?