Considering using Borax I have a question though!

There are a couple of different kinds of acid feed systems, all somewhat similar. Basically, you have a tank of acid which is slowly fed into the system any time the pump is running. This might be done by a small chemical feed pump or by a special valve that regulates the feed rate as acid gets pulled by pump suction.

Because of your high fill water TA, your TA will tend to go up, which will in turn tend to cause the PH to go up. Acid is added to counteract these increases. You can do the acid addition manually, or get a system like the ones I describe to add it for you.
 
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