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 3.3 out of 5 by 17.
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
Rated 4 out of 5 by from Noise I've had the filter for a few year & it works fine. The problem I'm having now is that it has gotten very loud/noisey. I replaced the impeller, but the noise continues. It appears the bottom piece that goes around the impeller is loos e & falls off & I think this is making the racket. Can this be replaced with an oversized piece to prevent it from drpping off & hopefully cure the problem?
Date published: 2017-12-21
Rated 2 out of 5 by from Marineland Power Filters I’ve bought these filters for years but now rethinking. After a couple years (2) I’ve been having to replace the impellers. It’s already starting to wear out the rubber like ends. Also the bio wheels quit spinning and they just don’t spin. Replacement parts are available hence rethinking buying more. The last filter I bought lasted for many years with out much maintenance.I moved from Virginia to Utah and bought all new equipment, not sure if that is a factor.
Date published: 2017-12-13
Rated 2 out of 5 by from Did not last as long as I would have liked I have had to replace the impeller multiple times. Other than that it has worked perfectly until recently. After a little more than a year of having it it has stopped working and will not even try to start up again.
Date published: 2017-12-12
Rated 3 out of 5 by from Been using for years I’ve bought these filters for years but now rethinking. After a couple years (2) I’ve been having to replace the impellers after 6 months on 3 of them. It’s already starting to wear out the rubber like ends. Also the bio wheels quit spinning, bought replacements and they just don’t spin. Replacement parts are speedy hence rethinking buying more.
Date published: 2017-12-05
Rated 5 out of 5 by from Emperor 400 The only reason I have had to replace this filter is due in fact to the many power outages in my area,other than that, it's the best pump I've ever had, I use two of them on my 125 gallon aquarium, no problems at all otherwise.
Date published: 2017-11-30
Rated 5 out of 5 by from Efficient and quiet and great customer service I bought my filter almost a year ago and it worked great....it did begin to be noisy though so I wrote Marineland for advice. They just sent me a new pump. Great customer service. I was problem shooting but they replaced it fast!!!! Good job!!!!
Date published: 2017-10-24
Rated 5 out of 5 by from Great Service when help needed! I have had a series of these filters which last for 5 to 6 years and by then somethings wear out and I buy a new one. My more recent filter was fine except it would stop pumping water to the bio wheels unpredictably. I thought maybe the fit for the impeller was a bit tight. Anyway I asked for help and got a very quick response saying you need this and this which they mailed out gratis. I installed the new parts and my filter is working as I expect it too. What a great company!
Date published: 2017-09-08
Rated 5 out of 5 by from never quit I've had this filter over ten years at least, a few parts fatigued over the years but nothing a twist tie couldn't fix. Paws now petco, gave me their spare pieces, (plastic spray tubes, clips) from old filters they didn't use. I'm about to finally get a replacement. Mine is STILL working, just so much salt buildup , little broken parts etc, and reduced water flow Warrent it. Again it's well over over ten years old. My best guess is 2004, it's 17 now. Great dual bio wheel system.
Date published: 2017-08-12
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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

How do I replace the spray bar on an Emporer Bio wheel filter

Asked by: Gadgetgirl
Those are sold separately. You basically pull it out and insert the new one. http://www.marineland.com/Products/aquarium-parts/Filtration-Products-and-Skimmers/Emperor-Parts/Spray-Bar-Assembly-Emperors-PF280B-PF400B-PF280BD-PF400BD.aspx. There is a gray clip on yours that you need to keep to lock onto the new one. BREX
Answered by: BREX
Date published: 2018-03-15

Is there a store in Rochester mn that carries a marineainland #p filter?

Asked by: Jo Befort
Probably not. That is only sold through Petsmart online, and www.amazon.com. BREX
Answered by: BREX
Date published: 2018-02-21

What gallons does a biowheel 350 system support in fish tanks?

Asked by: Pw25
The Penguin 350 is rated for tanks up to 70 gallons. The 400, whose page you linked here, is for tanks up to 80 gallons. BREX
Answered by: BREX
Date published: 2018-02-12

Our filter seems to have quit, We’ve had it less than a year and clean it completely once a month and today I noticed it had just stopped pumping. We have the BIOwheele 350 Penguin model. 

Asked by: Skaye
Remove the impeller and impeller housing. Soak the impeller in distilled white vinegar after removing any debris you find. Swab out the motor itself (middle of the bottom of the box) with white vinegar as well. You may have hard water or calcium buildup which can only be removed with vinegar. If this doesn't work, please call 1-800-322-1266. BREX
Answered by: BREX
Date published: 2018-01-31

The carbon I have been using seems to fall to the bottom of the media holder. Is there a larger carbon or am I loading it wrong?

Asked by: Jodi L
There are definitely different types of carbon on the market, ours is Black Diamond. Make sure you are filling the media container completely. If it is ours, lay it flat, and fill each section before snapping it together. BREX
Answered by: BREX
Date published: 2018-01-22

I noticed that the small collar that the inlet tube attaches to near where the impeller seats is broken on mine. I just got this 400 not too long ago. I do remove the impeller once a month for cleaning but am always careful when putting everything back.

Asked by: Jodi L
Please call our Care Team for a replacement part, 1-800-322-1266. BREX
Answered by: BREX
Date published: 2018-01-22

I have a model # PF300B. do you hve replacement wheels and filters

Asked by: hoover
Here are the bio wheels: http://www.marineland.com/Products/aquarium-parts/Filtration-Products-and-Skimmers/Penguin-Parts/BIO-Wheel-Parts-for-Penguins/BIO-Wheel-Assembly-for-Penguin-PF330B.aspx and here are the cartridges, you need Rite Size C. http://www.marineland.com/Products/aquarium-filtration-filter-media/rite-size-aquarium-filter-cartridges-filter-parts/penguin-power-carbon-aquarium-filter-cartridge.aspx BREX
Answered by: BREX
Date published: 2018-03-15

Please tell me the dimensions the Emperor 400 needs between the back of the tank and my wall, and the clearance between the unit and a shelf above it?

Asked by: BeCycle
Total dimensions of the Emperor 400 is 17 X 7 X 10.5 and the outside dimensions are 17 X 4.5 X 10.5. BREX
Answered by: BREX
Date published: 2018-01-15

Is there a spec sheet showing the wall clearance needed behind the aquarium for each of the Penguin and Emperor HOB filters?

Asked by: WayneO
Not that we send out, no. The Penguins need an average of 4" and the Emperor needs 5". BREX
Answered by: BREX
Date published: 2018-01-09

Are the bio wheels available for sale?   I need three    

Asked by: Gracie
Yes, they are available through out website, www.amazon.com, www.petsolutions.com, other sites, and local fish stores. http://www.marineland.com/Products/aquarium-parts/Filtration-Products-and-Skimmers/Emperor-Parts/BIO-Wheel-Assemblies-for-Emperors.aspx. BREX
Answered by: BREX
Date published: 2018-01-09

How far does the Emperor 400 extend behind the fish tank?

Asked by: josiah2
It extends 4.5". BREX
Answered by: BREX
Date published: 2017-12-22

What should I use for a 100 gallon tank?

Asked by: Rodney 2445
That depends on what you intend to house in it, but two of the Emperor 400 filters will definitely work or a Magniflow 360. BREX
Answered by: BREX
Date published: 2017-12-21

I have a 20 gallon heated, lightly planted glass aquarium with one betta. What filter would you recommend? Also, would a UV sterilizer be ok to use in the tank? Thanks!

Asked by: Amy101
We would recommend the Penguin 150 for this tank, and yes, a UV sterilizer would be fine, but not very necessary for a tank with very little fish load. Your betta would love some companions such as white clouds, corydoras catfish and nerite snails. BREX
Answered by: BREX
Date published: 2017-12-05

I need this Emperor filter. What is PRICE, and can I order from you and have it delivered ?? Thank you. Deborah

Asked by: Deborah MacFarlane
Hello Deborah, No, we do not sell direct, but Amazon.com, www.thatpetplace.com and Petsmart carry this filter. BREX
Answered by: BREX
Date published: 2017-12-04

Why did marineland stop making the emperor 280 ?

Asked by: Helnaak
Lack of sales, essentially. BREX
Answered by: BREX
Date published: 2017-12-04

how can i get the filter in filter box, filter seems too big for box

Asked by: who cares
The filter cartridges slides into the filter box, not the media container. There are slots it slides into, and the black plastic faces the front with the floss towards the back. If there is excess floss, you can fold or trim it. BREX
Answered by: BREX
Date published: 2017-12-01

I have 120 gal tank and it came with2 emperor 400. But no bio wheel. I bought a new one, With extension the bottom is about 3in away from the sand in bottom. IS this too close for it to work?? it wasnt working but did n smaller tank that i didnt use exts

Asked by: ashley95
Yes, when sand is in use, we recommend the intake tube not being more than halfway down in the tank. Also, it is a good idea to place filter floss inside the bottom strainer or use a sponge accessory purchased separately, to cover the strainer. BREX
Answered by: BREX
Date published: 2017-11-15

Is anyone at Marineland working on making the emperor 400 filters quieter. I have one on my 55 gal tank for 8 years and the filtration is great but it's not quiet. I bought a new impeller and it was quieter but not quiet. Now it's loud again. 

Asked by: MikeFitz
We changed the impeller about 2.5 years ago and this made the filter silent. However, if you have the old style Emperor with the new impeller, you also need the flow manifold cover to make sure it stays quiet. The impeller and manifold cover are sold together. BREX
Answered by: BREX
Date published: 2018-03-05

Used two Emperor 400 filters on my 90 gallon tank for over ten years with excellent results. Recently replaced one but was very disappointed to find there is no way to reduce the flow rate without completely shutting the filter off. Is there a way?

Asked by: RudeGoose12
No, not other than closing the mid-level strainer. That change occurred back in 2002-2003. BREX
Answered by: BREX
Date published: 2017-11-09

Would I be able to put a Emperor 400 pro series on a 30 gallon tank ? What I thought is maybe bigger filter for smaller tank better filtration ? 

Asked by: Aaronvidal
No, it would be way too big for a 30 gallon most likely. It would depend on the type of fish and you would need to leave off the mid-level strainer and extension. Just attach the bottom strainer to the intake tube, but it would probably be too powerful. We would normally recommend the Penguin 200 for that size, instead, if you wanted a larger filter. BREX
Answered by: BREX
Date published: 2017-11-03

Another quick question is there a difference between a Experor 400 Pro or regular Emperor 400 ? 

Asked by: Aaronvidal
The only difference is the impeller. The Pro was rated for 90 gallon tanks, and the latest version is rated for up to 80 gallons. The new impeller is quieter but a tad slower. All current parts fit both of them though as long as you have the current manifold housing COVER. BREX
Answered by: BREX
Date published: 2018-01-05

I would like know if I can get new bio wheels for my filter. The petsmart where I got the said you can not get the bio filters said she they should never fail well guess what I have one that failed

Asked by: Go fish
Bio wheels are readily available on our site, other websites and at local fish stores. They only need replacing when they become damaged. If they stop rotating, most of the time you need to maintain the filter system by taking it apart, and cleaning it out, especially the motor and the impeller. You should also clean the bio wheel bearings, and make sure they are properly installed in the filter box. If you need the Penguin 350 bio wheels, they are sold here: http://www.marineland.com/Products/aquarium-parts/Filtration-Products-and-Skimmers/Penguin-Parts/BIO-Wheel-Parts-for-Penguins/BIO-Wheel-Assembly-Penguins-200B-and-350B.aspx and here: http://www.petmountain.com/product/aquarium-filter-bio-wheels/11442-576312/marineland-marineland-replacement-bio-wheel-for-eclipse-2-emperor-280b-400b-filters.html?utm_source=googleproductads&utm_medium=cpc&gclid=CjwKCAjw9O3NBRB3EiwAK6wPT488vZo193VYsPNfTGD0DiBrROdoXKw2ezn54AGw5NODBt1yqwZ8TRoCgngQAvD_BwE as well as other websites. Petsmart does not carry parts, which is why they told you what they did. BREX
Answered by: BREX
Date published: 2017-09-15

What power filter replaced the 280B 

Asked by: Ez Lopez
None did. We only have the Emperor 400. Next closest in size is the Penguin 200. BREX
Answered by: BREX
Date published: 2017-09-12
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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