Calcium Chloride Source Pool
 

Calcium Chloride Source Pool stores carry tubs of a hardness product with 77% calcium chloride and 23% inert products. Any idea whether this is alright for hydroponics?

You know I see those products but I have never have gotten the balls enough to try them. I did use some of my pool pH down once in my hydro garden when I ran out of my regular pH down. But I didn't use it long enough to see if it would have a deferential effect on my plants. I sure wish I stayed awake in chemistry class so I would know what all that means.
Let that be a lesson from HydroRon. If you want to grow good pot then stay in school and stay awake in chemistry class.