I agree with Marie. With TH of 1000 and TA of 180 I would have predicted a milk-white pool. Bet those chlorine granules were cal-hyp...made the problem worse.

If you get TH down to 500, you'll need to get TA down to between 80 and 110 to avoid the cloud. If you get TH down to under 400, your TA won't be a problem at all.