Quote:
Originally Posted by foster53
400's are good filters, BUT over time the bearings that the bio wheels ride on wear, and ther wheels stop turning. If you get one make sure you can order extra bearings when needed. I got rid of all my emperors, and went with 110's, no cartridges to buy 
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If noise is a factor, then another reason to go with the
AC series. The Emperor 280 made a noticeable hum. It was somewhat loud. I've replaced it and now i can't hear the
AC at all. Now all I hear are the fans on my desktop
PC and thats starting to drive me nuts!