Sorry about the brief answer, but was heading out for Radiation Treatment.

I don't think it was Cal Mag, but rather sea salt.

The EC of the coco put my grow back two weeks at least!

around week 2-3:
The leaves were turning yellow and dying off, so I flushed the pots several times until the runoff was relatively clear (vs tea colored) and went off to buy my EC meter. I transplanted one each G13xhaze and Kandy Kush tomy DWC bucket in desperation.

However the flush did the trick. The differece was night and day. My seedlings started to grow again and get greener.

Fast forward to week 6... Flush first after the initial runoff readings... before using adittional coco in transplanting. Everything much smoother fterdoing so.

YMMV depending on the brand I would think...

The bag did say 100% organic and sea salr is, so truth in advertising is still alive and well. Beter to test and rest assured.

M. P.