Shane1 said:
I tried the pumice stone route last year and I went through a lot of them with minimal results. I have some friends that have very smooth tile and they just scraped their scale off with a razor blades. I think the best way to apply the acid is with a spray bottle but a brush will work as well.
Just found this site a few weeks ago. After reading so much I realize all the things I've done wrong over the last 10 years. One of which is let my CH get REAL high, then not really pay any attention to my PH.
You can imagine that I get the water line scale every year, and every year for the first 8 years I would use the stupid pumice stones to scrape off the Calcium build up. This litterally takes forever and is a huge PITA. But if you got a week (or two), and maybe a few kids to take turns at it, it will take the scale off.
Last year however I had an epiphany, and some how realized that the Muriatic acid would take the scale off. I used a spray bottle, diluted the acid 50/50 with pool water, and one of those house hold scrubby pads. I finished the whole pool in about 2 hours. Spray the acid on a 5-6' span, scrub 2-3' at a time with the pad and work your way around the pool.
Now that I found this place, and bought my TFT Kit, I'm working on lowering my CH and keeping my PH down. :-D
CLB
ETA: My experince is on tile. I'm not sure what it would do on stone (if there would be a difference)