The Emperor 400 is on sale as well. My understanding of the major difference between the Penguin and the Emperor is that the Emperor line uses dual pumps whereas the Penguin only uses one. The two benefits to the dual pumps are that if one fails the filter will continue to run, albeit at a reduced capacity, and that is much quieter. The cost difference is negligible. The Penguin 350 is on sale at Petco for $39.97 and the Emperor 400 is $54.97.
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