I usually use AN at half strength so if i were to do that with the AN sensi cal it would come out to like 500ppm of cal mag. They dont suggest using cal mag tho. Their sensi cal bottle says its made for people using other brands that have cal mag issues. I was using it at 150ppm per one of their support reps telling me to stay at or under 150ppm if i decide to use cal mag. I think im going to only use it now if i see a cal mag deficiency