I have a 22K gallon saltwater pool using an AquaPure Pro. I have been trying to get the Free Chlorine to stabilize for 4 weeks. I can generate about 2 parts Free Chlorine if I boost the pool for 24 hours, but after a day or so it is back to 0. My Phosphate = 100, The Ph = 7.7. Total Cl = 1.01. Combined Cl = 0.71. I have shocked with non-chlorine oxidizer. Total Alkalinity = 75. What can I do to maintain free Cl other than run the boost for 24 hours every other day? I am running pump 10 hours per day. I have tried as high as 90% generation on the AquaPure Pro. Am I going to have to add Cl tablets every few days to keep the free Cl? Of course if I add Cl directly I will turn the AquaPure to 0%. The AquaPure unit is new about 45 days ago. Salt Level = 3000.