Have you added anymore CYA? If not, add some more to the sock. It will help save chlorine burn off from the :sunny: .
With a CYA of 20, your recommended chlorine should not go under 2 but you still need to shock Tabi.
Disregard the Pool Stores recommendations for chlorine. They are too low and don't account for the CYA/Chlorine relationship which you can find in pool school.
Your akalinity is high and it maybe the reason why mom and dad were fighting with it last year. To bring it down, use MA to lower your pH down to 7-7.2 and add bubbles to the water. Your pH will rise and it will eventually bring your TA down. If it's not low enough <90-120> bring the pH down again with MA and add more bubbles. It's a process Tabi. It takes time.
I have used DH's air compressor for this. 
With a CYA of 20, your recommended chlorine should not go under 2 but you still need to shock Tabi.

Disregard the Pool Stores recommendations for chlorine. They are too low and don't account for the CYA/Chlorine relationship which you can find in pool school.
Your akalinity is high and it maybe the reason why mom and dad were fighting with it last year. To bring it down, use MA to lower your pH down to 7-7.2 and add bubbles to the water. Your pH will rise and it will eventually bring your TA down. If it's not low enough <90-120> bring the pH down again with MA and add more bubbles. It's a process Tabi. It takes time.
