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Bakki and TT work well because air has 250,000 times the saturerated oxygen content of water. If one cover those design the efficiency goes down. If you expose it or even using an electrical fan the effiency goes up .... but at the price of loosing water temperature.
Submerged media is not as effiency in oxidization but not too sensitive to ambient temperature. Mix and match in filtration types would produce the best combination result. Donald
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