My pool is 25,000 gallons. Since I started aerating, my PH has stayed around 6.8 as I've added acid. I've been adding 1/2 gallon at a time twice a day for 2 days for two gallons total. This morning my PH is at 6.8 and my TA is still around 240. With the TA so high I'm hesitant to shock the pool or add any algaecide. The algae in the pool is clinging to the vinyl so tightly that no amount of scrubbing or my pool cleaner is removing it. I live in Wisconsin where the cold weather has not really relaxed it's grip. Could the cold temps be part of my issue?