What is this discoloration and should I do anything about it?
Ignore the debris on top - I'm talking about the splotchy discoloration
I've had the pool 5yrs
Gunite is 8-10yrs old
I'm pretty sure p.o. had issues with low pH (some grout corrosion around tiles evident) and high pH after converting to SWG (scaling on the tiles when we moved in!)
I have strictly maintained the pool chemistry according to "Water Balance for SWG's" since ownership.
For the first year I ran the pool at slightly negative CSI to remove the scaling from the tiles.
The discoloration is visible only in indirect light - had to wait for an overcast day to be able to photograph. It's been more or less this way since we've owned it. Is it scaling?
I am lead to think it's scaling from p.o. as the pool cleaner wheels have left 'tracks' on the wall at the point it climbs so far, and no farther; and the wheels spin against the gunite.
Input welcome, thanks!!