Our pool is about 1 yr old, this is our first winter. We live in Florida and kept it open, no heater. In ground Gunite 10,000 gallons with cartridge filter. Current temp is 67. We use the BBB method all summer, but went back to using 3" pucks with stabilizer for winter because it's easier and we don't swim in winter months. Test once a week in winter and usually only have to add muriatic acid. The problem is that the CH keeps going up. Is this because of the puck or does it have something to do with the water temp or some other reason. Water is always clear.
Any help or suggestions would be appreciated.