I drained my pool a few inches below the tiles and closed the pool with a mostly solid cover with a mesh opening in the middle. I have had a pump under the cover to keep the water level from getting to high. I opened the cover a bit today to take a look and notice a reddish tint on all of the below the water level. I then tried brushing it off with my hand but then realized it was extremely rough. I got my brush out and tried brushing a few spots to see if the would remove the roughness. It removed some but it was still pretty rough. I wasn’t planning on opening the pool for another month and a half but now am worried. Ph level is also off the charts. Should I try lowering that with a muriatic acid and a submersible pump? Any ideas on what this could be? I assume it is scale. I m looking for any advice on what to do. I took a like 3-4 weeks ago and it wasn’t nearly this red or rough