I saw this at Seaview too... was in use in one of their display tanks.
From bits of info i could find online, apparently it pulls in water from the bottom by air lift, collects dirt and waste in the compartment (which you can periodically remove and clear out), while letting water though the black cone and up through the bio-media. Could be a good system for running adsorption resins like Purgien or Matrix Carbon too, or even just as a bio-media filter.











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