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Again thanks to all for the input. Regarding my algae problem, I brushed and vacuumed the pool on the 27th, the day of my original post. I did not SLAM and continued to keep to normal levels of chlorine and brushed / vacuumed once between then and today Sep 3rd. Knock on wood, no signs of algae...

Thanks for the feedback everyone. I've been reluctant to believe that I'm dealing with mustard algae, because it looks green and is not patchy. However, there is no denying it's fits the description of recurring post SLAM, once maintenance levels of chlorine are restored. Again the grey plaster...

My pool, located in San Diego, was resurfaced last year with a medium grey plaster. After start up the pool company set the CYA to 60 PPM. Not knowing better, I used tablets for a few months and my CYA rose 80 PPM. On 2 separate occasions this summer algae growth has forced me to shock the pool...