I did a search for this but didn't find anything that directly related to my question....I have an inground pool and earlier this summer we had some problems with yellow algae that I quickly cleared up. We've had a TON of rain the past month or so and after each "bout" I shock the pool BEFORE problems set in (I noticed if I didn't they inevitably DID).

When we had the yellow algae it was very silty and easy brushed up...but now I am noticing yellowing in a lot of areas of the pool that cannot be brushed and nothing changes once the pool is shocked. The pool DOES need to be refinished, but that will probably not happen until next summer. So I KNOW the surface is not in the BEST shape...anyway, does anyone know what might have caused this staining and also if there is anything I can do to remove it? The chemicals are perfectly balanced and the water is crystal clear but those stains REALLY bother me!