I hope several of you view the pictures, and let me know what you think. The stains do not show up as well on the computer screen as they do in real life. It does kind of look like red clay, but no clay here, just sand. We've tried power washing, and several concrete cleaners to no avail.
I am sorry if I gave the impression that the concrete is seperating and/or that I have the wrong liner or wrinkles. I do have a few hair line cracks-but everyone seems to think that they are just surface cracks.
On the other hand, I have a stained deck, and an a slightly unlevel pool, just enough to cause part of the liner border on the deep end to be under water, while the same section is above water on the shallow end. At first inspection,it looks like there is a flaw in the border. Upon close inspection, ( see waterline in the closeup pictures of the border) you can see that part of the border is submerged.

I also received a topmount instead of a sidemount filter,which costs quite a bit more than the sidemount..