Long term, you may consider just dosing with an extra gallon of bleach on Sat. AM. The results will be in just a few hours (quicker than granules) and you wont' be driving your pH down and CYA up.

That said, I would certainly use what you've got. Your pH could come down a little and the granules will help that. Test every now and then for CYA. It's probably about as high as you want it and the granules will continue to drive it up.