Janet's right, of course.

But, why do you want to raise your TA? It's a fiberglass pool. With your CYA that high, you are going to have to run VERY high levels of chlorine to avoid algae. Using bleach won't lower your CYA; it will just keep it from going higher.

You'd be better off adding borates (and acid) to get additional pH stabilization in the water. LOW carbonate alkalinity -- the part of TA that baking soda raises -- inhibits algae. High borates ALSO inhibit algae. On your pool, 6 boxes of borax, plus 2 gallons of muriatic acid should get you there.

Read this thread: http://www.poolforum.com/pf2/showthread.php?13111 about using muriatic safely.