Sudden cloudiness

[aylad]

It's not that "bad" really, but it's not surprising that you frequently have algae problems. Your sudden cloudinesss was almost certainly an algae bloom, which has been handled for now with the shock, but not for long since your chlorine is too low. With no stabilizer in the water, the sun depletes chlorine rapidly, making it hard to maintain a residual. I would add enough stabilizer to target 40 ppm, but you need to be maintaining 3-6ppm chlorine til it's in there, which can take a few days. This will take multiple daily chlorine additions. Your pH is ok at 7.2, hardness doesn't matter in a vinyl pool, and yoir TA needs to come up a bit, I'd target 60-80. You can use baking soda to raise alk.

Janet