Hi, and welcome to the forum!!
Not sure what chlor brite is, but if it's a clarifier, don't waste your money. Do you have signs of metal in the pool? Green staining anywhere? ARe you running your water through any type of filter before putting it in the pool?
If your pool water does contain copper, then your options are to either run it over a high chlorine source just before a filter, so it will fall out and stain the filter instead of your pool (and blonde hair and fingernails), or use the metal free, which does keep the copper in suspension so it doesn't fall out and stain anything. If you choose to use the metal sequestrant, you'll need to keep your chlorine on the lower end of the recommended range (for a CYA of 40, the range is 3-6 ppm chlorine), and the pH on the low end, which yours already is. And you'll need to add more of it when refilling with fresh water or if you see signs of staining.
Also--assuming you haven't added anything with bromine in it, yours is a chlorine pool--ignore the bromine reading.
Janet
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