The design is better with the Emperors. The Emperors are more heavy duty compared to the Penguins. The Emperor will have a lot less problems with biowheels rotation stopage (mostly the 330 and 170 models).Originally posted by dave76
What makes an emperor 400 so much better than a pengiun 330?
Having said that, The Penguins are fine filters except for the problem with the biowheels. They can stop rotating when the filter(s) get clogged or the bearing get gunk in them.
In your comparision, are the filters subject to the same tank, bio load condition/filtering work load?Originally posted by scott
In my case I have found the opposite to be true. My 280 clogs repeatedly but my 3 170s and 1 330 work well all of the time.