I'm suspicious of those tabs. Do they have copper listed as an ingredient? Also, get rid of the mineral cartridge. You do NOT want metals in your pool! Most people think it is chlorine that causes staining and turns light-colored hair green. But, it is copper that does it, not chlorine!

You'll want to add a little Borax to bump your pH up some. Start with about a cup added slowly to the skimmer while the pump is running, breaking up any clumps. After a few hours, retest and add more if needed. You can also work on lowering your alkalinity. Steps are here:> http://pool9.net/alk-step and also read:> http://pool9.net/muriatic/

If your tabs have no copper in them, (and with a name like 'blue' I am guessing that they do), you can use them. But, if they have copper in them don't.

You can ignore the bromine column on the tester. This is a chlorine pool, not a bromine pool. Go ahead and order the K2006.

Report back on the ingredients of the tabs.