My newly constructed pool was filled on July 10th. Almost immediately (two days later) I saw noticed black spots on the plaster. I didn't think anything of it at the time, as the pool was new and water was just added. It may be my imagination, but it appears the number of black spots have increased. This has caused me to worry that I have black algae.
Here are a couple of pictures:
I included my shoe (mens 8) in the latter as a reference to the size of the mark.
Also, I'd humbly request referencing this thread:
for some recent history/details on my testing numbers.
Do you think I have black algae?