TA Issue (I Believe)

Why do you want to decrease it? 120 is fine. You're in no imminent danger of scaling. If you just keep maintaining the pH when it rises, it will go down soon enough.

As it says in the How to Lower Total Alkalinity Article in Pool School
You shouldn't lower TA just to reach a target number.

So what is the issue? Is the water cloudy? Why do you want to decrease TA?

Could you also put your location in your signature or profile?
 
Yeah, I'm with 320.....leave it alone until you have some pH issues which will likely be never. You can read the article in Pool School so you'll know how if you ever have the need.
 
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