As per my comment in another thread.
Get a Hanna Phosphorus Checker (HC - HI736) for Phosphate (take the result, multiple by 3.066, then divide by 1000). This is the most accurate tester for Phosphate...
oh, and also rinse the mysis after defrosting, and discard the liquid.
...and pretty much everything Mindy said too, lol!
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