Opened pool 2 weeks ago. Went to local pool store had water tested. Added Calcium, ph down iron out and then chlorine (that was 2 weeks ago. Couldn't hold the chlorine after shocking (lost after 2 days). Water has been milky white or cloudy ever since. Sunday I super shocked by adding 12 lbs of chlorine and I still have the same milky/cloudy water. Dont know what to do. Have own a pool for the last 20 years....Help