Interesting, I don't recall hearing their Calmag does that. I only use 1 or 2 ml/gal, because I toss Azomite in with the soil, so it should be available, but I use RO, so I wanted to add in a little each watering. I have AN on the shelf, but it has twice the nitrogen. I liked AN, but with plants in multiple stages, all that fucking mixing all the time will drive you bonkers.That's what I'm using, at the moment. For quick and easy. It's working well for me.
I usually recycle, amend. Same soil for years. Had a bug issue, last year, cleaned house.
I also have some in roots soil, as well. I find the ffof is easier on young plants.
pbp is an easy line to use. Hard to burn em. I THINK I read their calmag has an ingredient that kills your bennies, though.
Good luck!