The water itself is crystal clear, but it seems like every couple days when I am vacuuming that in the corners where the wall meets the floor of the pool, I'm getting like a yellowish film on the bottom of the pool. When I run the vacuum over it, it seems to stay put but if I give it a little scrubbing, it comes off.
Wondering if it is the start of algae?
My chlorine levels were a little low when I just tested it out. About 4.5. So I went ahead and dumped a gallon of 10% in there which should get me up to around a 15 FC level. What does algae look like exactly?