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That really depends on the type of media. Obviously you can't run a trickle filter backwards... but submerged media, that really wouldn't matter I don't think-others may disagree. I use kaldnes k1 in a moving bed and it doesn't really matter in my application either.

As far as a refugium, I have never used one in a FW application. I have never really understood the benefits of it. But I am curious as to what you have in mind for yours.
 
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