Lowering alkalinity, Ben's method...

[steveinaz]

Correct, the 20oz's of muriatic acid is dropping ph to about 7.1, then the aireation is helping ph climb back into a "normal" zone while lowering TA...

The PH numbers above are before the addition of the muriatic acid, for clarification. I'm using the acid demand test to figure out how much muriatic I'll need to get to 7.1.

My acid demand was about 8oz per day, now I'm running 20oz every 12 hours (well, so far), I was afraid to go any heavier on the acid for a 12,000 gallon pool.

am I missing something? Do I need to verify how low ph is going? If so, how long should I wait after adding the acid to test? I want to do this right the first time...