Boric Acid

The sparkle is more of a hype, the feel of the water is better but not by much. Adding borates does not decrease your MA usage, it just spaces it out. Do you have pets? They cant drink pool water or they will get sick.
 
You would need 15-25 of those bottles, so there's going to be quite a sticker shock for what is really a very optional addition unless you can find it cheaper. I would also suggest finding granular, the powder is a real pain to get dissolved, it likes to sit on the surface of the water instead of dissolving.

And you are correct, you will want to drop your TA quite a bit before adding.
 
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