Newbie, I think I know the answer but....

[Watermom]

In the meantime, can you go to Walmart and pick up a cheap OTO/Phenol Red (yellow and red) kit? It will only read chlorine levels to 5 but you can force it to go higher with a dilution method described here: Testing Without a Good Kit

Focus on the testing and just bleach for now.

[PoolDoc]

Uploaded the pool picture of some remaining mustard algae, and edited it into the original location, but I'm putting it here, too.
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Health services, if you've got an "AFTER" picture, I'd love to have it.

Ben