If you'll look at the Best Guess page linked in our signatures, it will explain why, and give you the chlorine levels that you need to eradicate mustard algae. In your case, it will probably take 25 - 30 ppm sustained over a week or so, plus brushing. You'll have to get a K-2006 test kit (see test kit info page) to measure and control those levels.
There are other ways to do it, but they have other complications, too.
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