Ice exposed to the air in your freezer will be contaminated.
But, isnt the point of this.... what if its not exposed to air in the freezer ?
I would stay away from using ice. You can't guarantee the medium is free from CFU's. Use cold water filtered through a Brita or another in line filter that can take them out.
what if the ice is made from preboiled water and frozen in sanitized and air sealed containers ?
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