Polyvue,
A couple months ago I tried dissolving a couple cups of CYA granules in a gallon jug. Nope. Some did, most didn't. Kept pouring off the concentrated liquid into the skimmer and refilling and eventually after a couple weeks the solid was almost dissolved. Certainly didn't dissolve in 10 minutes. The granules are fine enough they will easily, or quickly, get past the skimmer and pump baskets. Once they make it to the filter how do you know how long they take to dissolve? I don't use the stuff personally. I smash up pucks.
Al