I have several black stains in the deep end of my pool. They are smudge/blotchy like in appearance. They range from a grayish to almost black. They were new this spring.
I have tried brushing with a nylon brush and also with a sponge with a scratchy surface on one side. Neither of these work.
The chemistry is good.
Any ideas would be helpful
I have tried brushing with a nylon brush and also with a sponge with a scratchy surface on one side. Neither of these work.
The chemistry is good.
Any ideas would be helpful