According to the MSDS sheet for Clorox Ultra 2, in addition to sodium hypo it contains Hydrogen peroxide 1-5%, Alkylbenzene sulfonic acid 6-10%, and Triethanolamine 1-5%.

Why would you want to add these extras to your pool?

I'd stick to the plain Clorox Ultra, or better yet the generic ultra bleach. Same stuff but cheaper.

Poolsolutions recommends staying away from the Clorox brands because they add "goo" to their bleach (http://www.poolsolutions.com/gd/bleach_0525.html) and here (http://www.poolsolutions.com/gd/ultrableach.html).