If your using RO or distilled water you can use 150 ppm cal mag, not 250. Too much is just as bad as not enough. Your plants are hungry, not overfed. If your using tap water you probably dont even need that. Distilled water, 150ppm cal/mag, add your bas nutes to bring the ppm to 800, let it sit for an hr, ph to 5.7, let it sit for an hr, if the ph is stable then run it.