Black Spots showing up on resurface

[Holly Pelts]

We have recently had our pool resurfaced and some areas in pics attached were visible since initial fill. However 8 weeks later there are more popping through. When questioning are so called start up tech for 4 week follow up he stated it may be black algae if it does not brush off. I cannot seem to at this time get a rep from the contractor we had for resurface to look at it. Looking for thoughts as to verify if this is/ or could be black algae or an issue with the resurface product 8 weeks post resurface.

Kindly Help

Holly

 

[Rancho Cost-a-Lotta]

Try to scrape up some of the substance with your fingernail. Wipe it on a white piece of paper. If the smear is green, then you have black algae.