I just completed a SLAM, the water is back to clean now. When I brush the pool everyday, I find there are many small air bubbles on the vinyl under water (not foaming actually, but like the air bubbles when you put Coke in the glass, but they are much smaller). Where do they come from? Anything I should worry about?
Last test result:
FC: 39 (just stopped adding more 10% liquid sodium hypochlorine)
PH: N/A (but before SLAM, it was 7.4)
Cal Hardness: 100