So, a few weeks ago I posted about some small red circles at the bottom of my pool. I used some Lo N Slo in a sock and it cleaned them right up. Sometime in the last few weeks these spots (shown in picture below) are on my concrete. I'm assuming this came from when I was walking away with the sock some of the chemicals got on the concrete. I could be completely wrong but it seems like it was about that time that we noticed these. I've tried to wash it with a hose and it doesn't come off. I didn't know if there is anything I can do. This concrete is only 2 months old. I've attached some pictures.