Patio slab stain?

Smileysmile1 · 30 May 2020

Hi guys
I had a new sandstone patio put down summer 2019. Looked great.
Anyway, noticed this bit of slab this year and don't know why the discolour. Looks like its bleached. I pressure washed the patio and its still there. Photos attached. Any thoughts? Thanks

Ian H · 30 May 2020

Salts in the pointing up?

Smileysmile1 · 30 May 2020

Is that what it is? Just on the edge and mortar. It's the only slab to be effected. Will it eventually disappear?

Ian H · 30 May 2020

I have bits on my house that come and go. It called Effloresence if you want to google it.

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Patio slab stain?

Smileysmile1

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