I am back with the green monster! I have made all the right moves and tests and the water stays cloudy green. I have gone through my inheritence in the form of chemicals. The pool does not maintain chlorine over night. What am I missing? The pool is located in Connecticut, 50,000 gallons, yes 50k cement kidney shape with a large DE filter. I have backwashed 3 times and refilled the DE each time. Current reading is PH 7.2, alk 110,hardness 190, chlorine now .5 no difference in readings for free chlorine. I added 7pounds of shock 2 times and this is the result.
Any advice would be appreciated.