I just cut the back of the cartridge and dump out the carbon. I've been rinsing and reusing them for about 4 years now.
The grey plastic cartridges are perfect for biomax too. I line them up and they can hold quite a bit of bio.
The only thing I font really care for is the spray bar. I just don't see the point as water is either running under the wheels or sprayed on top. Either way, the wheels are wet and exposed to air.
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Emperor 400 for me. It's a sealed unit so it's leak proof and start right up during a power failure. No need to stick a finger in to jump start the motor like the older AC. Quiet and no more cheap plastic rattle noises.
Decent review. Both good filters. I have been using both for many years. I am currently running 12 AquaClears and 6 Emperors. Most of these filters have been running for many years (15-30+). Both are reliable. Replaced one O ring on an AquaClear in all that time. I like the bio wheel on the emperors, however the holes on spray bars always need cleaning to remove clogged build up. Takes more time to clean an emperor than an AquaClear. AquaClears have better flow. So after all that IMO the AquaClear is the best HOB filter ever made. Emperors come in 2nd place.