For those of you playing along at home, here's what I did and here are my results:
Thursday night - turned off pump, removed the Polaris and added 4 gallons of muriatic acid. I also added 2, 1-Quart bottles of "Les Iron". I brushed the entire pool to mix in the acid two times that night.
Friday - brushed/mixed up the water in the morning and in the evening.
Saturday - brushed every couple hours all day long.
Sunday - gave it a final brushing or two in the morning then added half a bottle of "pH Raise" and half a bottle of "pH Stabilizer" and mixed it all up. I took the pH a couple hours later and it was a little low so I added another 1/4 bottle of each and it was about 7.2-7.4. I hooked up the Polaris and turned on the pump and resumed brushing the dust down towards the drain.
When I started, I had calcium scaling on every surface that was under water. The stuff on the walls was sharp, but could be scraped off with a fingernail or piece of plastic. The stuff on the bottom, steps, bench and tanning ledge (horizontal surfaces) was bumpy and also sharp but couldn't be rubbed or scraped off no matter how much I tried. Before I started, I had an OK feeling about the walls, but I was really worried about the floors because they seemed so much worse and did not respond to scraping.
After a day of the treatment, the brushing removed most of the scale from the walls! After the second and third day it was just about all gone!!! The floors showed a lot of improvement but they were still pretty rough. The color returned to normal, and probably 60-70% of the stuff was removed but it was still sharp/bumpy to the touch. The good news was that I was now able to scrape some of the "bumps" off the flat surfaces like I was formerly able to do with the walls.
Results - Walls - 95-99% back to normal....
Floors - 65% back to normal, but still need work
I'm feeling pretty good, but I know there's still a lot of work ahead.
For the rest of the week, I'm going to concentrate on removing all the "scale dust" that is now either deposited on the bottom or is mixed up in the (now cloudy) water, via brushing and running the pump.