Up until earlier this week, my pool wasn't holding chlorine. It was getting eaten up by organics and algae. SLAM'ed my pool for 4 days, and this morning I passed the 3 tests:
1. Water is glassy clear
2. OCLT < 0.5
3. CC = 0
Here's a full set of test results as of now:
Just added 2 quarts of muriatic acid to lower that pH.
However, I'm still seeing those plaster stains. I want to say that the stains are getting better, but I'm afraid there's too little improvement for my liking.
Did the vitamin C tablet in a few spots, none has cleared up so I can rule out iron.
Based on my test results, what do you think it is? I really hope there's a way to get rid of those without having to drain and acid wash... I mean, I just got this pool built 2 months ago and the swimming season has just started. Maybe it's because of high pH and it'll go away when I lower it? Will borates help?
Couple of pics: