Quote Originally Posted by polishpollack
What symptoms are there? How do you know calcium is the problem? If you're using a hydro fert, does it not have calcium?
My issue is not lack of calcium, its being calcium deficient.

The fert routine i am using is FoxFarm, so yes it does have calcium, but not enough as i'm finding through discussion with my LGS and research in online forums that shows its a common problem with the line.

i know its a Ca problem based on diagnosis through the guide in 'Marijuana Garden Saver: Handbook for Healthy Plants'.

I have 12 plants on a 25 gallon total system volume (+/- 1 gal) with an auto topoff on the resivor.

My specific question was to find out if anyone know which of the compounds i discussed would be my best choice to supplement the calcium levels in my current solution and to not react with the foxfarm routine.