I was in the process of brushing my pool today and when I pulled my brush up from the deep end there was a round rubber disc looking thing that was probably about 1 ft - 1 1/2 ft in diameter. I couldn't grab it before it sunk back to the bottom and the water still is not clear enough to see to the bottom in the deep end so I can get it back up. It was a light beige color and had slits about 1/2 from the edge all of the way around.
Any idea what this is? Is it okay to leave it, wherever it may be down there, for now?