The CYA I got to start up a new pool last weekend the directions were to pour it into the skimmer then wait 3 days for it to be dissolved. My experience with the sock method is after putting the sock in the skimmer a few days later there was still a lot of CYA in the sock, so I ended up just working the sock in the pool until all the product was out. The next times I added it, I put the sock in the water to let everything get saturated, then I just worked the sock until it was all worked into the water. I can't imagine it taking a week for it all to dissolve. I discovered today that I was out of the CYA reagent, I will get more tomorrow. That will be day #4 for the CYA, so I figure I will test tomorrow and see what it's like.