The cloud is grayish. My test results are fairly all normal. Test results are from last night. FC - .6, CC - .6 (just cranked up my salt generator), pH - 7.5, CH - 300, TA 110 (just added baking soda last night and that is not the cloud I am seeing). NOTE - I posted this already and may be worth repeating. I opened a week ago. The pool is a brand new gunite/aggregate finish starting its second year. On opening day and after three hours of my Polaris 360 working, the collection back was full with a big fist sized collection of stuff that responders of the post think is calcium sulfate. The guy at my retail store says its calcium. I am still picking this stuff up a week later, but not nearly as much. Also, the corners in areas are white looking like frost. This is getting better, but still there.