Milky haze on Flagstone

[er23423]

I have a Saltwater Pool. It's ~10yrs old. We have owned the house for a year. Chemicals have always(well mostly) been in balance.

Just in the past few weeks I noticed this white haze around the spa.

I am assuming the flagstone is not sealed.
Any idea what could of caused this? It's a pretty drastic color change and seemed to just appear. It certainly wasn't there last year and did not seem to gradually color.

I have read that washing with Muriatic Acid should clean it off.

Thank you in advance!

View attachment 35741

 

[JasonLion]

Does water tend to splash onto there? That looks like minerals left from evaporation. However, I can't think of anything that would cause that to appear suddenly, unless water just started constantly spraying onto there.

 

[er23423]

Does water tend to splash onto there? That looks like minerals left from evaporation. However, I can't think of anything that would cause that to appear suddenly, unless water just started constantly spraying onto there.

Thank you for your prompt response. I am sure it wasn't an overnight thing. It's on the far end of the pool and I just noticed it one day.

What's the best way to acid wash a small area? A disposable spay bottle and a brush?

 

[Donny]

A natural bristle brush is what I would use and dilute the acid with water. 4 parts water to 1 part acid at first is my recommendation. Go from there.

 

[Keithb]

If you spray a little muriatic acid does it bubble? If it does use the mixture above with a brush. I had a calcium build up and a wire brush and muriatic acid was the only thing that took care of it.


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