Hello everyone! I just recently purchased a new house with a plaster 10k gallon pool. This is my first time maintaining a pool and it has been a learning experience for sure! Unfortunately the house was unoccupied for a couple of years and from what the neighbors tell me the pool was a swamp for most of it. The people I bought it from did manage to get it cleaned up except for some stains in various areas. The worst staining is around the skimmer and the skimmer basket so I decided to tackle that first.
After doing some research here I thought it might be metal staining so I carefully followed the ascorbic acid treatment instructions. Unfortunately, it had no impact. I'm not sure what to try next. Any suggestions? Thanks!