The water looks clear and I did some pool tests. I think the pool is about 30000 gallons and it took about 15 pounds of soda ash to get the ph back to 7.2. It uses a DE filter and when I cleaned it, it was a bright blue color which I forgot to take pictures of. The following picture shows some of the debris in the filter (the filters were that blue color):
So I'm wondering if this is a really bad etching issue. Here's some pictures of the stairs that shows the differences in color.
There is plaster flaking off on the top step but on the other images that show the stairs, the pool was the blue-green color that shows around the tiles (pool04 shows a closer view of this). In pool03, that shows the other side of the shallow end which shows the pool is no longer blue-green in color but a really faded light blue.
I took a water sample to a pool store and these were the results
So I'm not sure how long the levels were/are off. I also have nieces younger than 7 and I said no one should be swimming in the pool even though the water looks clear. Is this just a cosmetic issue and I should keep running the filter until the filter stops turning blue? Or should the pool be completely drained? Or do I have to tell my mom that the pool is screwed and it has to be resurfaced?
Thanks for any help