I have been keeping my chlorine at shock level for weeks and all numbers are great; been running the filter for 24/7 for weeks except when I used a flock. Pool is still very cloudy, but now I can easily see the bottom at least. There are dark patches around the edge of the pool bottom that I assumed were just crud that needed scrubbed, but I have used the brush and even with firm pressure, nothing comes off. How do I tell if this is iron stains or something like that? In the 5 or so years we have had the pool, I have never had a stain on the liner like this before.
Also, my kids all have blisters on their toes from the grittiness at the bottom of the pool - is this possibly related or a calcium issue maybe? We have well water, FWIW.