Canna support told me to dilute my tap with Ro/Distilled to 0.2 EC and add calmag until 0.4.But It Means buying and buying not only calmag agent but also pH down that I finished Just today and also Canna Coco A+B and It Is not going to be cheap.
Can I use this as calmag?
I used It in reservoir some time ago and It created orangeish particles like rust that settled at bottom.