Sailork,
It really is much easier (and probably cheaper) to use borax and muriatic acid. They will neutralize each other and produce boric acid/borate buffer in the water and some salt. Just put in 5 cups of acid and pour a box of borax into the skimmer and repeat until you have reached your level. IF you go through this thread you will find where Richard has worked out the dosage for 1000 gal to reach 50 ppm and I gave a close approximation with easier measurements. Don't forget to get some borate test strips....I got mine online from
http://www.diywatertesting.com/aquachek_borate.html
They arrived in about 4 days and it was the cheapest price I could find...free shipping too.

Boric acid is not very soluable, if I remember my chemistry correctly. and you might have a problem geting it to dissovle...and also, if it lowers the pH too much you will need to add borax and that will raise your boron levels even higher.