Blueberry tree stain

[coog61]

I've had two Japanese blueberry trees next to the pool for 5 years with no issues. Recently it bloomed and then we were gone for a week. While we were gone a storm come though and left most of the blooms in the pool where they sat until our return. Where there were large mounds there is now brown stains that won't come off with brushing. Any ideas?

 

[Swampwoman]

Carefully apply a trichlor puck in a sock a few min at a time to see if that will lighten it.
You can also try one of these MA spot stain devices: Amazon.com : Purity Pool OS Out Spot Stain Remover : Swimming Pool Stain Removers : Patio, Lawn Garden

Tanin stains from decomposing stuff in theory will fade over time with sun and FC, though I have a few that simply won't

 

[basod]

Bringing your FC level up will clear up the stains.
I've been fighting undeveloped acorns blowing out of adjacent oaks for three weeks now.
Brown tannin stains if they sit overnight - very frustrating to have crystal clear water and little brown stains all over the place