New pool owner. We got away from chlorine tabs after our CYA got up to 120 and I found TFP. I am using Pool Essentials LC from Walmart. We are adding 128 oz at a time and my FC is going no where. Last night my FC was 1. CYA 49. ph 7.6. We added 128 oz of 10% LC last night. I checked my FC this AM and it was 2. Checked it again tonight and my FC is back down to 1. What am I doing wrong??