My pool is 4 years old. Initially they over acid washed it and made it dangerously rough so I had it drained and polished. Could this be the effect of possible over polishing certain areas? I first noticed a couple dark spots last year, but it has dramatically worsened over the winter.
Welcome to TFP! For a wealth of pool care information please check out our free Pool School. If you are in need of specific help then we encourage you to Register and ask us here in the forum!