Magnum® Polishing Internal Canister Filter

Product No. ML90770
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The Marineland® Magnum® Polishing Internal Canister Filter uses two refillable chambers to house carbon or customizable filter media. The Magnum Polishing Internal Canister Filter is the most versatile filter Marineland has to offer. Choose from every day, continuous three stage filtration or high efficiency polishing with the included micron cartridge. The submerged motor means quick and easy start up, no priming necessary! The Marineland Magnum Polishing Internal Canister Filter filters 290 gallons per hour and is ideal for aquariums up to 97 gallons.
Magnum® Polishing Internal Canister Filter is rated 3.5 out of 5 by 21.
Rated 3 out of 5 by from Works fabulous.... for awhile. I bought this product about a month and a half ago. I placed it into my planted aquarium with ease and used the carbon filter and it helped maintain the water quality and my tank was picture perfect. Cleaning the filter was the easiest part and I fell in love! Usually with normal filters and canisters it's a pain, too many cords&bulky parts. However, while cleaning the filter for the 3rd or 4th time since having it the part which holds the carbon snapped and broke way too easily and my O ring was broken in half. I was extremely bummed that I now had to switch to the polishing filter that doesn't run as well at all. I paid about 80 dollars for this filter at my local pet store and was over joyed with the product till everything seemed to break and start to lag. I suppose luck may have something to do with it. This product can be great.
Date published: 2017-07-16
Rated 5 out of 5 by from The best filter for my 65g acrylic Aquarium I replaced a HOB and a UV Sterilizer within Magnum filtration system and I love it I just wished MarineLand would make this filter for Aquariums less than 20g as I have a 15g heavily planted tank with a external MarineLand C series filter
Date published: 2017-07-02
Rated 5 out of 5 by from It really works! Over the 20 years I have had a number of different filters and the Magnum Polishing internal canister filter is the absolute best. I was having an algae problem when I bought this system. I had to clean the filter once a week at first because of the algae filling up the canister. ( I now clean the filter once a month as part of water changes). However, the water was crystal clear in my 45 gallon marine tank with in an hour and has remained that way every since. The funny part is that I did not realize my water was not clear. What an amazing difference this system has made in my tank. I would buy this system again and highly recommend it to any one that has an aquarium. I have had no problems and it is very quiet. I have left my larger system in place and will continue to use both at the same time.
Date published: 2017-05-11
Rated 1 out of 5 by from Lots of flow issues I have had this filter for 2 days. I planed to use it to help fight an algae bloom i'm having and used the media container for a phosphate sponge. Ran great for a few hours then the flow rate dropped to near nothing. I took it apart and cleaned it nothing, was clogging the intake or the impeller the filter sleeve it self did not even look particularly soiled. Ran it again for about 20 min and it went back to the same super low flow rate. Next i used the polish filter and it worked for a few hours the same issue. I tried to clean out the filters and they look almost new however it still moves so little water it cannot be that effective. If i run the pump in a bucket alone its fine so clearly the issue is the filters... however after a few hours of work in a 75gal tank this seems to pretty unreasonable. I would avoid this for any larger aquarium types. Summery: I would avoid this. To easy to clog up and takes constant maintenance on a larger tank. Would only recommend using for tanks no later than 40 gal.
Date published: 2017-03-02
Rated 5 out of 5 by from Unbelievable results Having the 38 gallon bow front kit, the marineland bio wheel 200 HOB is sub par for this set up, added this canister finally took the haze out if the water, I now pretty much use the bio wheel as a holder gir mh ceramic rings with just a pre cut piece of media in front, and use the canister as my main filter. Controlling the flow problematic but with some proper position have jt jusg right. So wish they would make a flow control. But other than that it us a awesome filter/polisher tank is now crysral clear water parameters are all perfect now we can populate the tank.
Date published: 2017-01-20
Rated 3 out of 5 by from Stopped pumping Output of water fail Took it thoroughly apart and cleaned and still not pumping really at all
Date published: 2017-01-07
Rated 1 out of 5 by from Blowing bubbles I bought this filter about a month ago and it's blowing bubbles bad. In a reef tank that is not good. I've used 2 hot 250's years ago and loved them. They kept the water crystal clear. Not loving the 290 how do I make it stop blowing bubbles.
Date published: 2016-12-30
Rated 5 out of 5 by from Great Product Santa dropped this off and I could see a difference in my 30 gallon cube in just hours! Easy to use, fits in well with the rest of the tank! I'm glad the man in the red suit dropped it off
Date published: 2016-12-27
Rated 5 out of 5 by from absolutely amazing!!! I just purchased this for a polishing filter because of a algae bloom problem. I was amazed of how quickly this little filter worked. It was so easy to use, the micron filter worked wonders, then I added a little diatomaceous power,and WOW what a difference.After having problems with other brands of filters using diatomaceous earth, I am sold!!! I will tell all my friends about this filterand theycan see for themselves the great results!! Thanks Marineland for a great product!!!
Date published: 2016-11-30
Rated 4 out of 5 by from white puffs We love the filter itself since once the lights go out it mak the take look so clear but all day we have the worst issue with the filter shooting out white puffs and it will not go away we have tried adjusting the filter and it makes no difference
Date published: 2016-11-20
Rated 5 out of 5 by from Crystal clear water in less that 12 hrs I set this up first as a two stage internal cannister filter in a large cichlid aquarium. 125 gallon that is heavily stocked. I have plenty of filtration but this gives the water the absolute perfect look. Super easy to install and set up and has impressive output. After a couple weeks i changed to the water polishing set up and its even more amazing. Great product. Well worth the price. Only down side and its a small one is trying to hide it. Need large rocks.
Date published: 2016-11-10
Rated 5 out of 5 by from Extremely fast filtration I just started a 60 gal plant tank. The substrate is all black flourite products with rocks and malaysian driftwood. 30 ltr total bags and what a mess, the water was almost black. i purchased a fluval u4 and ran for 2 days and still there was no change in the water. installed this filter system and by morning it was 75 % clear. by the end of the day it was crystal clear.This is the perfect start up filtration system for any tank. Highly recommended.The only draw back is the filter output is too high for my needs and i need to find a way to disperse the output as i need almost still water but require this level of filtration.
Date published: 2016-10-30
Rated 5 out of 5 by from Very pleased. Excellent alternative to H.O.T. Magn My H.O.T Magnum 250 was my go-to filter for the occasional cloudy water issues. This canister is incredibly easy to use. I like that it is completely internal to the tank so I don't have to leave the canopy open. It offers multiple methods of filtration which I have used effectively. It uses the same micron cartridge from the Magnum 250 which was nice given I had a few of those already. I was easily able to charge the cartridge with diatom powder and it was extremely effective. I'm currently using it as a supplemental filter. I filled the supplied cartridge with carbon and wrapped it in the provided pad. It runs silently. Very pleased with this item.
Date published: 2016-08-03
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My filter keeps losing flow and I’m not sure why. any suggestions as to why it seems to keep losing flow power?  I am using it as a polishing filter. 

Asked by: KdW79
Most likely it is becoming clogged, especially if you are using the polishing filter. That clogs fast because it removes very tiny particles as well as large ones, and it needs to be recharged frequently. See instructions on how to do this. BREX
Answered by: BREX
Date published: 2017-12-01

Can this filter be used in a 20 gallon fresh water aquarium? I currently use the Marineland Penquin Rite Size B Power filter that came with the tank. I'm having cloudy water problems & I'm having to replace the filter every week, but still cloudy.

Asked by: Pattilucy
It would be a bit too large. Cloudy water has various causes, so you need to determine what is causing yours. It is rarely the filter. Cycling through the New Tank Syndrome, organic protein, copepods, heterotrophic bacteria, over feeding, over stocking, etc. Instead of replacing the filter, try vacuuming the gravel and changing 4-5 gallons of water. If the filter cartridge is clogged, this is a sign of too much food or too many fish in the tank so cut back accordingly. Also, add Marineland Bio Spira to boost your biological filter. Last, but not least, there are some good organic adsorbent products on the market you can add to your filter to help out with this issue. BREX
Answered by: BREX
Date published: 2017-11-29

I might use it for a turtle tank, but she doesn’t like a lot of water so I might put it sideways. Is this okay? I’ve heard a lot about that if it’s underwater it should work, but just in case do you have any tips?

Asked by: Kodyg
As long as it is underwater and is vertical. If by sideways you mean horizontal, no, we have not tested it in that application. The outlet diffuser is adjustable so you can adjust the direction of the flow which may help with your turtle. I've used it with an adult Eastern Painted Turtle and she was fine with it. BREX
Answered by: BREX
Date published: 2017-11-29

Hi I am Ponraj from India, Can we use food grade diatom powder for recharging the cartridge ?

Asked by: asraj
Yes, you can. BREX
Answered by: BREX
Date published: 2017-11-30

Bought the internal canister filter 1yr ago. It worked great the 1st 6 months then it stopped cleaning the water. I've purchased new blue sleeves & new poishing cartridges but to no avail. The water looks muddy. Any suggestions? What do I need to do now? 

Asked by: LadyTona
If you are not doing partial water changes, it is in desperate need of a good vacuuming and partial water change. Every tank needs these in addition to filtration, usually at least once a month. The discolored water could also be due to any number of other reasons, such as the breakdown of driftwood if you have some in the tank. There is not enough information provided to be able to assist you fully. BREX
Answered by: BREX
Date published: 2017-11-20

The extension tube with flow diverter wouldn't stay on the outlet tube on the turret. The moment the water jet comes out, the extension tube get pushed right out. what am I missing here?

Asked by: ph8886
It should snap on. There is a small hole in the diffuser that goes over a very small nub on the tube. Make sure you are connecting them correctly. BREX
Answered by: BREX
Date published: 2017-11-17

Could this be used in a 10 gallon aquarium 

Asked by: Stevie g
No, it is too large. BREX
Answered by: BREX
Date published: 2017-11-10

Does this filter agitate the water enough for airation or is a seperate airator needed. Thanks

Asked by: BLUEkoi
Definitely if you put it right at the water level. You can also add the Maxi Jet venturi adapter to create more air. BREX
Answered by: BREX
Date published: 2017-11-07

Recently my Magnum Polishing Internal started to get loud. I found the outlet/impeller housing to have small cracks all around where the rubber part of the impeller sits. This allows for the impeller to wobble. Where do I get a new housing? 

Asked by: Lyles307
Called in and was told that the parts are discontinued for the Magnum Internal Polishing canister filter. Sad that I bought this less than a year ago and can no longer get parts for a filter that has worked great until the part failed. I was going to buy two more of these for my other tanks until I found this out.
Answered by: Lyles307
Date published: 2017-10-31

Hola que tal tengo un magnum polishing ML90770 rompi mi contenedor de carbon y medios cual es la pieza de reemplazo ? Parte PA0145 O PR1545

Asked by: Jorman
¡Hola! Necesita esta parte: . Sin embargo, no viene con el manguito de filtro. BREX
Answered by: BREX
Date published: 2017-10-24

How far under the water do I have to place it

Asked by: Brooksblee
It should be fully submerged for optimum performance, but the top inch or so can be out of water. BREX
Answered by: BREX
Date published: 2017-10-24

I have bought two Magnum polishing internal canister filters and two of them were defective so I replace them. I have one that's got a broken impeller. all I need is 2 replacement impellers please let me know where I can get them please

Asked by: Big B
Defective how? This filter comes with a 3 year warranty on it. Please call our Care Team for help with this matter - 1-800-322-1266. Impellers are the same as the ones for the Maxi Jet Pro 1200 and readily available via our website, and at BREX
Answered by: BREX
Date published: 2017-10-20

The filter can get really loud. Sometimes unplugging helps. Any suggestions? Only had it a month.

Asked by: Heather2112
Ensure it is fully submerged at all times, and take out the impeller to check for anything caught in it. If you have sand substrate, you have to remove the sand from the power head and the impeller and find a way to prevent it from being pulled into the filter. BREX
Answered by: BREX
Date published: 2017-10-18

I need to replace the Media separator

Asked by: john0514
Replacement parts are sold here - BREX
Answered by: BREX
Date published: 2017-10-06

Does the filter come packaged with the diatom filter cartridge?

Asked by: Susan Ohio
It comes with a micron cartridge, a filter sleeve and a carbon media container. You can use diatom earth with the micron cartridge. BREX
Answered by: BREX
Date published: 2017-10-04

Just purchased this today. The dealer did not have the files floss sleeve or the filter cartridge replacement. Where can I buy them?

Asked by: Heathern2112
Those are the same as the ones for the HOT Magnum. They are available on our site, as well as Pet Solutions, Pet Mountain, DRS. Foster and Smith, etc., if your local stores don't carry them. BREX
Answered by: BREX
Date published: 2017-10-04

I love this filter, but recently I've run into a problem. We have it running as a second filter in our 150 marine tank. In setting up the tank the gasket was misplaced and now the filter shoots out bubbles, despite it being completely submerged. Help!

Asked by: Skadooshn
This filter takes the same gaskets as those for the HOT Magnum. BREX
Answered by: BREX
Date published: 2017-10-04

How many watts does it operate at? 

Asked by: Molaver
Answered by: BREX
Date published: 2017-09-28

Where can I purchase a replacement diverter?

Asked by: RickBorja We do not sell the diverter by itself. BREX
Answered by: BREX
Date published: 2017-09-25

How I can buy the spare part is " foam Gasket " for marineland magnum polishing internalcanister filter, I want buy two,thank you.

Asked by: fday
Unfortunately, we do not sell to outside the United States. BREX
Answered by: BREX
Date published: 2017-09-19

You are very nice, but you did not answer my question, please tell me I need the part which is " foam Gasket " use for Marineand magnum polishing filter,I need to buy two help me please,thank you.

Asked by: fday
We do not sell to Australia, unfortunately. BREX
Answered by: BREX
Date published: 2017-09-19

How tall is this thing incl motor?

Asked by: apistodave
10 inches. BREX
Answered by: BREX
Date published: 2017-09-19

We bought this filter and the first few days it was quiet and cleaned the water. Now it makes an aweful humming/crackling sound. My boyfriend has cleaned it and looked over the directions and it still makes this sound. 

Asked by: Dwyatt
Make sure he removed the impeller and cleaned it and inside the motor where it resides. Q tips work best for the motor. Also, if you have sand as a substrate, you may have some caught under the magnet or the impeller. If you cannot resolve the noise, please call 1-800-322-1266. BREX
Answered by: BREX
Date published: 2017-09-15

We have this polisher (ML90770) and we love it. Unfortunately, the foam gasket went into the sink drain and inadvertently got chopped by the garbage disposal. Where can I get a couple replacements? Thank you!!

Asked by: Darci
You need PR1514, BREX
Answered by: BREX
Date published: 2017-09-12

I purchased this filter on 7 March 3017 and the motor recently stopped running. What are my options in this regard?

Asked by: Yuliisa
We would first recommend you open the powerhead, take out the impeller, and clean it and the inside of the powerhead with vinegar. If this does not get it operating again, call us at 1-800-322-1266. BREX
Answered by: BREX
Date published: 2017-08-29

Does it Airate?

Asked by: Elliottelliott
Yes, by moving the water it aerates, but you also have a plug you can leave out, and leave the top inch or so up out of the water to provide additional air. Or you can add the Maxi Jet 1200 Accessory kit with the venturi and adapter. BREX
Answered by: BREX
Date published: 2017-09-25

I recently purchased this filter and absolutely adore it. Problem is, while rinsing it at the end of the month, I somehow dislodged the little plug and it slid straight down the drain. Is there a way I can purchase a replacement plug?

Asked by: px4471981
Are you referring to the plug that goes on the diffuser? I believe you need item ML90770-602, but we do not sell it separately at this time. Please call or email us and we'd be happy to send one to you. 1-800-322-1266 or BREX
Answered by: BREX
Date published: 2017-08-29

would like to know if you carry hoods to a 30" tank

Asked by: phillis
Yes, in both the LED style and the old recessed fluorescent style as well. BREX
Answered by: BREX
Date published: 2017-08-22

I just bought this filter and installed. Its making a crackling noise and the outlet does not produce any bubbles. I just see ripples on the top layer of water. Is this normal? Should it not pump water out with bubbles?

Asked by: Kishore Prasad
It will not produce bubbles unless you add a venturi to it, which is an optional item, and sold separately. Pull the impeller out of the powerhead and re-seat it to stop the crackling noise, if it doesn't stop on its own in a few hours. BREX
Answered by: BREX
Date published: 2017-08-16

I can not get clear water. I am also confused as to where the foam gasket goes. The strainer as well. Is there a video available to assemble this filter?

Asked by: kwhitley
Hi kwhitely! We sure do have a video available! Check it out here:
Answered by: Customer Service
Date published: 2017-08-08
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ML90770 - 97gal/290 GPH