I put just over 4 cups of CYA powder into my skimmer (without the sock), over the course of about an hour. AMount was based on the calculator (asking for over 5 cups, but I shorted it a bit with the +/- margin). I would pour a cup in and let it desolve a bit. At one point, because it was clogging the skimmer I figured it was restricting the flow, so I would just twirl my finger a and let some of the smaller pieces disolve. I could see some particles through the window of the pump cover. All of the powder dissolved (or atleast went through the skimmer basket) after an hour or so. I have left the pump on for several hours.
I saw where sometimes it takes a day or so to disolve. Did I harm anything by allowing larger particles to get into the pump basket? I'm not so much worried if the CYA treatment was "weakened" by the stirring. I can add more at the end of the week, if necessary.