Just opened the pool and my fiberglass stairs are yellowish. I noticed these stains last season but didn't know the reason. Now I see that it is probably because of iron levels in the water. Since my water is below my steps at the moment, would this be a good time to clean them? If so what cleaner should I use?

Or should I fill up the pool, add a sequestrant, and let that remove the stains? Thanks!

Henry

Now would be a very good time to clean them, you can remove the stains without putting the iron back into the pool

Ascorbic acid or citric acid will remove the iron. I've also used lemons on small areas successfully. This will take a bit of elbow grease and would be time and energy wasted if you don't use a sequestrant HERE is a link to the Pool School article on stains.

Hope you have a great pool season with sparkly white stairs

Thanks for the help. I read through the article and it seems odd that I would have yellow iron stains considering I use municipal water (although its not of great quality). But every part of the stairs that were submerged have a consitent yellow and I noticed it would get worse after adding bleach. So, I'm gonna use some lemon juice to see if it makes a difference and if it does I guess I'll head to the vitamin section at walmart? Unless there's a better way to buy abscorbic or citric acid.