Oh, I think I get it. You think that rinsing with tank water is supposed to somehow PUT bacteria onto the filter media, and you don't see how that can happen since there's not much bacteria floating free in the water?
Well, that's not the point. The point is to not remove the bacteria already on the media.
Now, NEW media that is about to be used for the first time can certainly be pre-rinsed in the sink, since it has no bacteria on it anyway.
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