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I became a BBB user since July 1, and use 3 lb shocks and 2 tablet during past two months. the CYA level tested by a pool store was 100 ppm on July 4. my CYA test result using TF-100 was 40-50 on July 8. The CYA level keeps the same range of 40-50 using TF-100. I went to the pool store to...

You are right. I totally added 6 gallon of MA to the pool during the past 4 months, while the TDS should only increase around 100 ppm.

Lowering pH means adding a lot of Cl-, increasing TDS, which is already very high in my pool. There is error message for high salt on control panel everyday. TDS was 3500 ppm when we moved in; then it jumped to 4000 TDS. I heard the best value for TDS in swimming pool is 1000-2000 ppm. Can...

Test results: FC:<0.5 TA:160 CH:340 pH:>8.2 CYA:40-50 TDS:4000-4200 ppm, read from control panel Tapping water: pH: >8.2 TA: 210

It is in gound pool with 26,000 gallon, cartridge filter. There is a pump running around 12 hours per day to circulate the water. The pump can be used to drain the pool?

Thank you for all your reply. I will post test results tonight. I do not know the details of equipment. Do I need rent any equipment to drain the pool? After reading the posts, I think drain 1/3 is safe.

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...