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I was wondering if anyone had any idea what these knots are. I'm not sure how else to describe them. I bought a house in January and it came with a swampy concrete pool. With the help of TFP, I now have a sparkling clear pool. Now that I can see the bottom clearly, I noticed these knots...

I just would like to say that I have learned a lot from this site. I bought a house in January and with it came a 33k IG swamp. I have never had a pool, but I have turned the swamp into an almost clear pool thanks to all of you here. I still have yet to pass an over night test. My pump died...