It says on the website :
"This product is not necessary when using
MEGA CROP as your base nutrient! Some growers in Coco Coir may need extra CalMag depending on strain and coco brand."
Its kinda funny because I am almost out of Remo MagnifiCal so I might try this as a replacement to finish off those nutes on my indica reserviors. The sativas like stronger soup so they get first crack at mega crop w/ bud explosion pk booster. I'm at week 2 flower but bit think it would be ok to switch nutes this res change.