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a couple of key points have been hit on above. It is one thing to have the greatest service area per volume (such as with matting). But matting is a royal pain to clean. K1 on the other hand is self cleaning (in fluid bed) and can be in static bed by fluidizing it with air and then dumping the water.
So like most things in life...it is has to be a compromise between cost, space needed, and ease of cleaning. If cost permts....I would go K1 static followed by K1 fluid.
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