Hello everyone.
A new problem, noticed only today after several days of leaving the solar cover off. 20 or more of these black, comet-shaped marks, ranging from an inch to 4-5 inches in size, in one corner of the poll's shallow end. They do not vacuum off, and they do not brush away!
Please, someone tell me what is happening, and what can I do about it. I hope the jpeg makes it clear what's going on.
Thank you!
A new problem, noticed only today after several days of leaving the solar cover off. 20 or more of these black, comet-shaped marks, ranging from an inch to 4-5 inches in size, in one corner of the poll's shallow end. They do not vacuum off, and they do not brush away!
Please, someone tell me what is happening, and what can I do about it. I hope the jpeg makes it clear what's going on.
Thank you!