Over the last 2 weeks I've noticed there are tiny white/yellowish flaky bumps forming all along the tile waterline and plaster walls of our 20,000 gallon in-ground pool. The bumps are rough and with some heavy rubbing can somewhat flake off from the waterline tiles (I haven't tried rubbing it off the plaster walls). Is there any way I can remove this?
I've talked to Leslie's Pool Supply and they told me my only hope was to use their Ultimate Scale & Stain Removal bundle for $125. I talked to other pool supply places and most said the was nothing I could do about it besides sand blasting the pool walls which could cost $800. My first guess is that the bumps are calcium deposits. Its been about a 1.5 years since we last drained the pool and I guess the high calcium and high pH finally had an effect. I spent the entire weekend shocking the pool with chlorine to get it clear again (it turned green while we went on vacation last week).
Here are the results from the TF100 test after the water was clear enough to see through to the bottom:
FC - 25 ppm
CC - 0
pH - 8.2+
TA - 130
CH - 160
CYA - 100
What should I do next? I was thinking to buy either Stain Free or Muriatic Acid but I didn't know if this was the correct move or which one to get or how much to buy. Please help as I hope my pool isn't ruined forever.