I wouldn't test anything here. That just looks nasty.
Here is my take on it, you have two choices. Return it, get your money back and try something else.
Drain off the water in the bags and rinse with tap water to kill off any bacteria in the substrate and make it inert. Even then, I am not sure that you wont have a problem with it.
I would say option #1 is the way to go though.
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