Pitting on steps

You think those pits have been there the entire time and you just noticed them or are they how recent?
 
You think those pits have been there the entire time and you just noticed them or are they how recent?
Good question. I don’t know. They only stood out to me this evening because I had the pool light on to vacumm which I never do in the evening and I noticed it the way the light at the deep end was shining on the steps. I just went back to some of my photos through the years but not close enough for me to tell.
 
It looks like the type of pits left by the spikes plasterers wear.


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