Hello Everyone. I'm new to the TFP site and a new pool owner. I'm studying as much as possible and talking to some good people at my pool store, but no one can seem to offer any effective method for getting rid of what appears to be small spots embedded in the imperfections in the plaster that I believe are from dirt. It looks spotty as if someone sprinkled dirt, but it won't sweep out. I have tried Vitaman C, stain remover, iron and copper sequestering and chelation treatment, etc... I cleaned the cartridge filter in my Pentair with a special treatment to get the iron out.
I live in Southern California near the mountains in the Inland Empire. The soil is basically decomposed granite. I have included a picture of my spa floor. Hopefully, you can see the speckling and offer a suggestion. Thanks for any help.