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Question DetailsAsked on 11/8/2017

how to use copper sulfate to remove mold on concrete decking around pool. Decking is covered with small stone

pebble finish and pressure washing can damage the surface. Concerned about safety of using copper sulfate. Pool decking drains toward boarder shrubbery around pool.

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1 Answer


Mold or algae/moss ? If just mold, use a concrete cleaner and bristle broom - or even just a dishwashing liquid detergent and bristle broom - mix in water before applying to avoid risk of any staining from the concrated soap coloring.

For algae/moss - ask the contractor who put it in, if you had it done. Copper sulfate can stain at times (badly turquoise or bluish with some limestones and marbles, for instance) so certainly test an out-of-the-way spot first.

I would check instructions for use from a reliable company - like Lilly Miller Moss Out. I would use the spray-on liquid for even application, because the granule/powder type might well leave spot blemishes.

Answered 2 years ago by LCD

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