For water with a CYA level of 80 ppm the chlorine level needed to SLAM the pool is 32 ppm. And it needs to be kept at 32 pm until the water holds the chlorine level. In order to reach that level of chlorine in your pool you would need approximately 5lbs of DiChlor. And you would need to check the chlorine level 2 or 3 times a day and add additional DiChlor to replace the lost chlorine.
That said, I would not recommended slamming with DiChlor. Because using DiChlor causes other issues. Adding DiChlor also adds additional CYA to the water. 5lbs of DiChlor adds approximately 30 ppm of CYA to 10,000 gals of water. That would bring your CYA level to 110 ppm. CYA levels at 110 ppm would raise the chlorine SLAM level to 43 ppm. It would be a viscous circle. Not to mention that CYA levels above 100 ppm are not recommended and the only ways to lower the CYA level is to drain water and replace it or use a very expensive reverse osmosis process.
The most effective and easiest way to SLAM a pool is with liquid chlorine. Pool chlorine is preferable because it comes in strengths of 10% or 12%. Some pool stores carry liquid chlorine. In my area, WalMart has pool chlorine. The big box building supply stores have pool chlorine. Some Ace hardware stores carry pool chlorine. And in my area, some janitorial supply stores also carry pool supplies including pool chlorine.
Liquid bleach can also be used but liquid bleach strengths range from 5% to 8.25% so it would take a lot more. And there are other caveats with liquid bleach. You don't want to use a bleach that has scents or any other additives. So that leaves most of the Chlorox bleaches out because they all (except Chlorox sanitizing bleach) contain ColorMax additives. The bleach shouldn't contain anything other than calcium hypochlorite and inert ingredients.
If you want to learn more about properly slamming a pool, there is an article at InyoPools Here
There is a more in-depth article along with a video Here
If you decide to do the SLAM, you will need to turn the SWG off for the duration of the SLAM.
Let us know if you have additional questions or need additional help.