How to clean leaf stain from Fiberglass steps?

[Woody007]

This was my first year opening the pool on my own and it worked out great.
Since opening I've had a lot of wind and many leafs floating in the pool. I remove them several times a day, but some are leaving a stain at the water line.
Brushing doesn't phase it, but Magic Eraser helped a lot.
There is still a line that I'm having trouble getting rid of.
Is there a scrubbing product that I can use to get the last of the waterline stain out?
Thanks!

 

[Mdragger88]

For organic stains bleach is usually helpful.
Mix 50/50 with water in a spray bottle & then use your magic eraser. Wear gloves. Rinse with pool water.
Be sure to use unadulterated bleach/liquid chlorine just like you would add to the pool.
No splashless, fabric protection, cloromax technology, or flavored stuff.
Got any pics?
Can you share your latest test results?

 

[Woody007]

For organic stains bleach is usually helpful.
Mix 50/50 with water in a spray bottle & then use your magic eraser. Wear gloves. Rinse with pool water.
Be sure to use unadulterated bleach/liquid chlorine just like you would add to the pool.
No splashless, fabric protection, cloromax technology, or flavored stuff.
Got any pics?
Can you share your latest test results?

I'll try a little bleach. Thanks.
I don't have any pictures but the stain came from floating maple leaves and some tiny seeds about the size of pepper flakes. Might be Cedar or something else that's been blowing in the 40mph wind.

 

[Mdragger88]

Your fc is quite low for your cya level

FC/CYA Levels
Try getting it into target range & see if that doesn’t help as well.
Why is your cya so high? Overshoot your target?

 

[Texas Splash]

Let us know how the bleach attempt works. If it's still there, try rubbing a Vitamin C tablet on a stained area. Some leaves have a slight iron content.

 

[Woody007]

Your fc is quite low for your cya level
View attachment 488366
FC/CYA Levels
Try getting it into target range & see if that doesn’t help as well.
Why is your cya so high? Overshoot your target?

I know my levels don't exactly agree with TFP recommendations, but they do for the liner manufacturer, so I try to stay in their range for warranty purposes.

 

[Woody007]

Let us know how the bleach attempt works. If it's still there, try rubbing a Vitamin C tablet on a stained area. Some leaves have a slight iron content.

Today the stains are pretty much gone. Yesterday the Magic Eraser took off some, and maybe overnight the Eraser remnants dissolved the rest?
It finally stopped blowing so hard and now the steps are bright white without the ring.
Thanks!