Hi-Probably metals like iron.
It also looks like maybe copper and silver stains.
Can you show the system?
Do you have a mineral system?
Can you pull the cartridge and show it before and after cleaning?
I don’t know how to do that.Where is the salt cell?
Can you remove the cell and show looking into the cell from both ends and looking into the pipe where the cell commencts?
Can you pull the grids and show them before and after cleaning?
Can you post all chemistry readings and all chemicals that have been added?
I don’t have the acid level. Can a pool store measure that if I bring in a water sample?Cyanuric acid level?
Can you post a list of all chemicals that have been added?
They can, but it is not reliable.Can a pool store measure that if I bring in a water sample?