Keep going with the high chlorine until your algae problem is completely cleared up...once you add the metal sequestrant you're not going to be able to bring your chlorine up high enough to fight the problem, so that that done first--water should be clear, blue, not cloudy. Keep running your filter 24/7 until the cloudy clears. I would go ahead and add Borax so that you can bring your pH up a little, but mbar recommends no more than 7.2. However, 6.8 is low enough to be acidic and cause damage to a liner, so if it's a liner pool I would go ahead and address that. AFter that, I would put stabilizer in a tube sock and hang it in front of a return, so backwashing won't wash it out of the pool before it dissolves. THis will take a few days to dissolve, but you want stabilizer in the water to protect your chlorine once you get the other problems taken care of. In the meantime, I'll see if I can get Marie (mbar) to offer her advice on this thread since she's the stains/metals guru around here.

Hang in there!
Janet