Okay good. Just wanted to double check on that TA.
The powder and the liquid do equivalent jobs. The liquid dissolves immediately but is much more expensive than the powder. The powder dissolves very slowly, over the course of several days, but is much cheaper. Most here use the powder. We add it by either predissolving it (hard to do) in warm water and then adding it, or by putting the powder in a sock or a knee-high stocking and hanging it in front of a return jet. You don't want to have the powder sitting on the bottom of the pool because it's not good for the surfaces to sit in powdered form like that.