I do not know what is going on with the green water/bromide thing. But, I can tell you that you must get your pH up ASAP. Any readings below 7.0 are acidic and will damage your pool. You can use some 20 Mule Team Borax to raise your pH. Look for it in the laundry aisle at Walmart. Can't suggest how much because I don't know the volume of your pool. Also, what type of pool is it?

I doubt that your alk is 0. Pool stores often give inaccurate readings. That is why we suggest buying a good test kit like the Taylor K-2006 so you can do your own tests. If it is, you can raise it with some baking soda.

Is this a newly filled pool? You have no cya in there and that is one reason (in addition to the algae/green pool mess) that is causing you to lose chlorine so fast. The dichlor is stabilized which means it has cya in it, so if you continue to use it, your cya will rise. We like 30-50ppm for cya. You might just want to use bleach for your chlorine right now. It won't contribute to any cloudy water problems. If you want to use dichlor later after you get this all cleared up, that is fine. (As long as you monitor the cya level and don't let it get too high because that creates a whole different problem.)

Right now, the most critical problem you have is the low pH. Must get it up ASAP. Also, more chlorine. Like Ben noted above, it is probably going to take a lot of chlorine over a period of time to rid the pool of the bromide/bromine.