Not sure how "Scott from Florida" got in there.
Ha. I needed a good laugh. Okay, so here we go.
1. Add muriatic acid to lower the pH down to about 7.2. Since you can only use a pH of 8.2 as a starting point, start with one gallon of 31.5% strength muriatic acid. But have a second gallon ready as it will probably take a little more after that. Have the pump mixing the water well and brush the area you pour the acid just to help it disperse well.
2. Let that MA mix well for about 30 minutes and do a second test. Hopefully the pH will be closer to the upper 7 range at this point. From here, add another dose of MA as required to get the final pH adjustment to about 7.2.
3. Once the pH is at 7.2, it's time for liquid chlorine. Don't bother with the SWG yet. Increase the FC to about 10 ppm, let it mix for about 10 minutes and test again. Let's be sure the FC is trying to hold somewhere between 5 - 10 ppm after that quick 10-min test. If the FC did NOT hold for 10 minutes, then repeat the 10-min drill by adding chlorine and re-testing until it holds.
4. Once the FC holds as hoped, add only enough stabilizer to get the CYA to "30" for now in preparation for a
SLAM Process. You may not need to run a SLAM, but we'll confirm later. Zero to 30 stabilizer should be about 8 lbs 12 oz in that big pool.
Let's start there and follow up with us once you get this far.