I'm in a similar situation, just not so severe. I've added over 30 gallons of bleach and can't get the FC above 2 ppm, then it quickly drops off the chart. Is there another chemical I need to check? Water is milky and clearing but the water temp is 55 degrees. I didn't think algae could grow at that temp. Should I just keep adding gallon after gallon of bleach until the FC reaches 10 for the initial shock? I've never had this happen before when opening the pool.