I am the new owner of swimming pool for four and half months. The pool was excellent when we moved. The FC was 4 ppm, only pH was high around 8.2. I added MA to reduce pH, while pH was not lowered due to high alkalinity.
I found TFP website in the early of July and knew the BBB method. I stopped adding 3" tablet and switched to bleach. FC was 0 before I switched to bleach. 4 gallon of MA was added to lower alkalinity (around 80-100; used to be 190) and pH (7.2-7.5). However, pH jumped back to 8.2 a few days later and alkalinity climbs slowly. I use the test kit recommended in this website and test results showed that pH of tapping water is 8.2 and alkalinity is high in tapping water.
Since the pH is not well adjusted and bleach does not work effectively, green and black algae are growing at some spots in swimming pool. Do I need to add MA quite often to lower alkalinity and pH? Is that OK to leave the pool with high pH? TDS jumped to 4100 ppm because around 6 gallon of MA was added during these 4.5 months. Do I need to replace the water? I need to shock the pool right now?