Diatomaceous earth is also used as a filter medium. Use use a paper filter and the filter sucks in the DE and coats the paper of the filter. This lets you filter down to the micron level.
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I have one of the old vortex diatom filters and I also have owned the marineland filter just not together. On both units the only time mine would put out bubbles is if it still had air in the line (like not primed all the way) or foam media in filter became dirty which slowed down the filtration. Hope this helpsJust came here to ask why my new Marineland internal polishing unit spent all day rattling and spitting out bubbles... I bought food grade powder...