I live in columbia, SC and work for a local pool company. We have recently come in contact with some kind of pink mineral buildup on one of our plaster pools. I took a few samples of this pink substance to be tested, and when i scrape it off it flakes into small pieces. Its on the steps and floor of the pool around both of the main drains.
The substance seems to look like some kind of calcium. One of my friends in the business thinks it could be organic calcium.
The chemicals have been in great shape, calcium between 150-300 ppm, so until the samples come back im left scratching my head.. If anyone has info on this it would be great.