I have an 8 month old gunite pool in Oklahoma. It is 15,000 gallons and is not heated. I have an ozone chlorinator. I am battling brownish stains (similar to what a tea stain looks like) all over the bottom (an some up the sides), they seem to be really bad where the steps are (in that "L" spot that's hard to reach w/ the brush). I read several of the threads here regarding stains and did the Vitamin C test. In less than an hour, I have a humongous BLACK stain where the Vitamin C "sock" was on the bottom of my pool!!! I am FREAKING out b/c this black stain is much larger than the brownish stain was to begin with! My levels are all normal/balanced (chlorine, Ph & total alkalinity). The pool temperature is 78F. Did I mention that I'm freaking out??
I hope someone has a cure-all...
Thanks in advance...