Started getting the pool ready for winter yesterday. Removed stairs, brushed and vacuumed. Water analysis was as follows:
Water temp 48 degrees F
My target for slamming was an FC of 20 (based on CYA OF 50). So I added 264 oz of 10.8% chlorine along with 4 oz muriatic acid to lower PH to 7.8 at 2:40 in the afternoon. There was a bit of sun on the pool for a few hours following so I retested at 7:40 in the evening. FC was 17 and PH still 8.0. I added additional chlorine to bring FC back up to 20, along with another 4 oz of acid. Tested this morning and FC still 17 and PH 8.0. Should I add more chlorine until it stays at 20??? The sun is rising and the pool will have another 8 hours or so of sun now. Or do I call it good and start draining and cover pool. And what about PH?