I moved into my house 2 years ago and over the last two years I've noticed my pool plaster now has more and more dirt stains. The stains are on the bottom of pool, steps, and spa seats. There doesn't seem to be dirt stains on the walls.
I brush once a week but for some reason there seems to be more and more dirt stains. The stains don't seem to brush off either so it's slowly gotten worse over the last 2 years.
The pool is about 10 years old and I have noticed that the plaster is some what rough but not extremely rough. Not sure if this is why the dirt stains won't brush off.
Any suggestions would be really helpful. Thanks!