Max addition of Muriatic Acid when ALK is super high? Thoughts about Nitros steps on lowering Alk?

[DougA]

Nitro wrote an AWESOME article on balancing TA and PH that seems especially helpful after a refill.  Thanks Nitro!  Curious if folks still use this method OR if this method leads to PH drop that is too low or damaging to equipment?  

Some knowledgeable folks I chat with said this process would lead to too much of a PH drop but Nitro seems to be saying the PH won't drop much if the Alk is super high.  Curious if anyone has used this method and checked the PH to ensure the Ph is not getting too low. 

In his article, he wrote, (steps quoted directly from his article)......

"1. Turn on all your jets and air features and keep them on the entire process. (i.e. Aerate)

2. Calculate how much you want to lower your TA, and how much acid you need to add to lower it.

3. Add to the tub HALF (not > 1 cup nor < 1 TBS) of the amount of the remaining acid you need to add.

4. Aerate for 30min, and check TA/pH.

5. If TA > Target and pH is > 7.8, goto step 2.

6. If TA > Target and pH is < 7.6, goto step 4 one time.

7. If TA > Target and you can't get pH > 7.8 via aeration, Target too low. Stop here.

8. If TA = Target and pH is > 7.8, Target too high. Lower Target TA and goto step 2."

 

Also, in step 3#, he says

........"Add to the tub HALF (not > 1 cup nor < 1 TBS) of the amount of the remaining acid you need to add (to get to the target Alk)"........

Is he referring to not greater than one cup of dry acid?

If so, how much is the max amount of 31% Muriatic Acid that can be added at one time (as long as its less than 1/2 of the amount needed to get the ALK to target?
 

Thanks, Doug