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Patio slab stain?

Discussion in 'In the Garden' started by Smileysmile1, 30 May 2020.

  1. Smileysmile1

    Smileysmile1

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    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
     

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  2. Ian H

    Ian H

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    Salts in the pointing up?
     
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  4. Smileysmile1

    Smileysmile1

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

    Ian H

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