Emperor® Power Filters

Product No. PF0400BD
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Emperor® Power Filter Systems are advanced aquarium technology at its finest. With a revolutionary design, the Emperor’s flow and filtration efficiencies are unmatched by other filters in their class.

Featuring as much as twice the filter cartridge capacity, additional chemical filtration capability, and extra large, spray bar-driven BIO-Wheel wet/dry biological filtration, Emperor Filter systems offer aquarists a filtration system that can stand up to any aquarium they can dream of.

Emperor® Power Filters is rated 3.2 out of 5 by 16.
Rated 5 out of 5 by from Marineland, Emperor, Eclipse System, and Penguin The ideal filter for me would be: 1. A filter that offers Mechanical, Chemical, and Biological Filtration. 2. Relatively inexpensive. 3. Easy to clean. 4. A filter that will last a long time. There are two main filter systems on the market that have been doing this for years. Both are owned by larger companies. While I like the competition's filter using a sponge to do the Biological Filtration, the Marineland Design, Emperor Power Filters, I have found to be the best due to the ease of cleaning. One does not have to take out the sponge to clean it every time they replace the filter cartridge, just leave the Bio-Wheel in. This technology is the best, and I bought my Eclipse 2 System around 1997.
Date published: 2018-06-05
Rated 1 out of 5 by from The worst, I Bought this 3 weeks and the water was never clean, I will never recommend this to no one
Date published: 2018-05-10
Rated 3 out of 5 by from BUT A MILLION STARS FOR CUSTOMER SERVICE Unfortunately, I think I received a faulty product. I called the 1-800 number to see what my options were since I purchased it off Amazon. An actual human lady picked up the phone after like 2 rings! NO PROMPTS! I explained my issues and that I didn't know what to do and *BAM!* without even submitting any receipts or serial numbers she is sending me an ENTIRE NEW UNIT. I was shocked.My LFS highly recommended these filters as they only use the Emperor 400s on all of their tanks, my son has 2 that are at least 10 years old and his fish are awesome. I really, really hope I just received a faulty one because if this new one works, I will buy everything from now on from Marineland. And the human lady's name is Sara and she ROCKS. Thank you!!
Date published: 2018-05-04
Rated 1 out of 5 by from Better filters out there We have 4 up and running as backup filters. They are high maintenance, loud, and we replace parts more than anything else. It seems like we are doing something to each filter once a week. I had really great hopes, but when these finally die, we will not be replacing them.
Date published: 2018-04-30
Rated 2 out of 5 by from Filters quickly..........however We bought our first Emperor 400 in 1999 and replaced it after about 14 years because it kept getting louder and louder even though we took it apart and cleaned it well. The new filter (same kind) is now just as noisy as it's predecessor! We have performed all of the maintenance suggestions on this site, but it has not stopped the noise. It sounds like my coffee maker when it is gurgles at the end of the brewing cycle. We highly recommended this filter to friends when we purchased the first one - however, I would hesitate doing so now
Date published: 2018-04-24
Rated 2 out of 5 by from Progressively louder I have had this filter for 8 months and it has gotten louder and louder in the past 2 months, I have never used it dry and I have cleaned it regularly I have not been too impressed.
Date published: 2018-03-18
Rated 3 out of 5 by from Amazing water flow and power VERY HIGH maintenance needs cleaned 2 times a week if you want the filter to last longer then 2 weeks cheaply made sadly but very effective if you keep it looking brand new. when you clean it, be careful when removing the intake from the top. PUSH DOWN on the square middle black piece the intake pipe goes into whiling SLOWLY pulling the intake pipe out. ALSO if you have a sand bottom tank DO NOT USE THIS FILTER sand will get into the intake and completely destroy your filter. id advise anyone to buy the canister filter or any exterior sump pump. hope this helps
Date published: 2018-01-25
Rated 3 out of 5 by from I wish I could get my hands on a 280gpm I've got 2 of the 400s on my 75G tank, work great low maintenance.My only complaint is I've got a smaller tank 40G that the 400 will not fit on but the 280 would, but I can't find in store or online that ships to Canada.
Date published: 2018-01-15
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what size replacement filter cartridge?

Asked by: Jeannine
This filter takes the Rite Size E cartridges. http://www.marineland.com/Products/aquarium-filtration-filter-media/rite-size-aquarium-filter-cartridges-filter-parts/emperor-power-aquarium-filter-cartridge-bio-wheel-filter-replacement.aspx BREX
Answered by: BREX
Date published: 2018-06-14

Hello, why was the Emperor 200 discontinued? I see the only one offered now is the 400, do you think that is too big for a 54 gallon tank?

Asked by: WC100
Grab the Emperor 400!
Answered by: easeltine1
Date published: 2018-06-05

My filter has stopped working, it won’t suck up water anymore. 

Asked by: Mikemangosweet
Sorry to hear that, but most likely it needs to be taken apart and cleaned. In particular, pull out the impeller, impeller housing and intake tube. Clean these parts as well as the motor in the middle of the filter box. BREX
Answered by: BREX
Date published: 2018-05-29

I have been using my filter for about 5 years and recently it’s been very loud. It sounds like the pump and impeller are making the noise so I pulled it all out and cleaned everything but It only seemed to help for a couple days. Any suggestions?

Asked by: Kiefer
We are sorry to hear it is making noise, Kiefer. Please call us for help at 1-800-322-1266. We are happy to help!
Answered by: Customer Service
Date published: 2018-05-15

How big is the slot to slide the filter on to the tank? My tank has a frame about 1" with an inner lip that os another 1/2" will this fit my tank?

Asked by: Jamatt
It varies, since the spillway slopes, from 1" to 1.25". BREX
Answered by: BREX
Date published: 2018-05-03

do you sell just the stem for this model. i lost the long part that goes in the tank during a move.

Asked by: blindner3
Yes, we sell all parts for this filter. Click on the Parts tab on the product page. http://www.marineland.com/Products/aquarium-parts/Filtration-Products-and-Skimmers/Emperor-Parts/Intake-Tube-Extension-for-Emperor-PF280B-PF400B.aspx BREX
Answered by: BREX
Date published: 2018-04-02

Is Marineland going to discontinue the Emperor 400? I've been using Penguin and Emperor filters almost exclusively for as long as I can remember. I've been in the hobby 35 years and have never found a better power filter.

Asked by: WYAquarist
Thank you for your support and kind words! No, we have no plans to discontinue the Emperor 400 at this time. It's pretty popular. BREX
Answered by: BREX
Date published: 2018-06-05

I have a SeaClear 40 acrylic tank, the opening for the HOB filter is 15" wide. Can the Emporor 400 fit that?

Asked by: IndyNC
No, it is 17" wide so it will be a couple of inches too long. The Penguin 350 is exactly 15". BREX
Answered by: BREX
Date published: 2018-03-20
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PF0400BD - 80 gal/400 GPH

 Emperor Power Filter Manual

Emperor Quick Set Up Guide


Certified Flow Rate

Aquarium Size

Rite Size Media

Emperor 400

400 GPH

up to 80 gallons


Penguin & Emperor Cartridge Dimensions