Top Step Stain

I had my pool recently resurfaced from plaster to pebble last October. I noticed that occasionally my chlorine floaters would like to float above this top step. Being a new pool owner I didn't think anything of it at the time but recently I've noticed that the top step is discolored. I have already tethered the chlorine floaters to the pool cleaner hose and that seems to keep them in the middle of the pool, but I'm wondering if anything can be done for the top step.

I contact the company...

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