Do *NOT* use Yellowtrine: it's sodium bromide. Using bromide is an old-school method of dealing with problems with the chlorine/stabilizer ratio . . . but it leaves you stuck with a bromine pool that will consume chlorine at an incredible rate. Eventually, the bromide is converted to bromate, but until that happens you're going to suffer.

Instead:

1. Read the "Best Guess" page, linked below

2. Order a K2006 kit from Amazon (also linked below)

3. Meanwhile, DOUBLE your chlorine input each evening . . . but use plain storebrand 8% bleach. If you keep using cal hypo, you may end up with calcium that's too high, and very difficult to remove. Brush the pool AFTER adding the chlorie

4. Report test results from the K2006 ASAP, particularly your stabilizer level, which is the determining factor in knowing how to manage mustard algae.