I've read about using Borax to raise borate levels in your pool, but why would you want to do this? What does it buy you? I ran the chem_geek's spreadsheet and for my pool I would need:
43 pounds of Borax
13.75 gal muratic acid
This would result in 49.49ppm borates and not much change in TA or PH, with TDS increasing ~400ppm.
Now if I were to do this, what is the return? There has got to be a reason as there are products sold for this very thing.