Sorry, but I don't go back and check for other threads under your user name, and I wasn't paying attention to the fact that there are two posters in this thread.

So. . .

1. As best I can tell, you can operate BBB method, with one exception: you'll have to ignore the high CC (combined chlorine) levels. They will eventually drop, as the "Shield" breaks down.

2. There are benefits to using cal hypo, but I don't think they are related to the Shield product per se. I'm pretty sure you can use trichor or dichlor without any special issues, and completely sure you can use bleach (sodium hypochlorite).

3. You may want to purchase some polyquat as a backup. The Best Guess chart is not necessarily reliable in the presence of the Shield product. If you find that you are developing some algae, raise your chlorine somewhat, and add the polyquat till things are back under control. (www.poolsolutions.com/polyquat.html)