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.

Mine quit expelling water.  Just sits there and makes noise.  I cleaned it, changed filter, and changed medium , still nothing but noise

Asked by: Pammoore
Remove the impeller from inside the powerhead, and check it for debris such as hair-like strands. Swab out the powerhead with a q tip and some white vinegar. If you tend to have hard water, soak the impeller for about 10 minutes in vinegar. Call 1-800-322-1266 for more help. BREX
Answered by: BREX
Date published: 2018-01-15

is it possible to order parts to my filters here?

Asked by: Douglasfresh
That depends on what parts you need. Some are available under the Maxijet 1200 and some are available under H.O.T. Magnum. BREX
Answered by: BREX
Date published: 2018-01-08

Hi I own two Magnum polishing filters which i really love when thier working. I was cleaning one of them and noticed that the black cap that sit on the impeller is ripped up and i need another i also would like to get the rubber gasket 

Asked by: Douglasfresh
The rubber caps that are on each end of the impeller, only come with the impeller, not by themselves. This powerhead is the same as the Maxijet 1200 Pro, and takes the same parts. Call 1-800-322-1266 for additional help. BREX
Answered by: BREX
Date published: 2018-01-08

Hi I got this filter for Christmas. I liked that many reviews said it was quite, however mine makes a rattling noise when I have the regular filter in it. Any suggestions? Thanks

Asked by: BLUEkoi
Hi, yes the carbon container. I have been trouble shooting with the team, and hopefully get it figured out. Has anyone found a way to keep the carbon in the in the carbon container? Even with the sleeve on it comes out. Should I put it in mesh bag of somekind before it goes into the hard container?
Answered by: BLUEkoi
Date published: 2018-01-07

After 6 or so months one got noisy and flow dropped. Figured it was time to try an impeller assembly change, but don't see a part listed under ML90770. The head on this canister shows the part number MJ1200, it that the correct impeller?

Asked by: Nels
You may just need to soak the impeller in white vinegar, and swab out the powerhead with vinegar as well. If you do need the impeller, it is the same one as the one for the Maxi jet Pro 1200 powerhead. BREX
Answered by: BREX
Date published: 2017-12-22

Can this filter be used with an external motor control? I'd like to be able to reduce the flow at times so it's not quite some traumatic for the fish.

Asked by: BSchulte
No, we wouldn't recommend using it in that way as it could damage the motor. BREX
Answered by: BREX
Date published: 2017-12-15

How do I clean or replace the impeller. there are no instructions for this.

Asked by: Hodoe
Once you have removed the filter from the tank, twist off the shroud (part #5) and the powerhead. You will need to remove the turret (part #3) as well, then pull the impeller out, clean it and inside the powerhead. Once clean, reinsert it, magnet first, then twist the turret back on, place it back in the shroud, line them up with the canister vessel, and twist it back on. If you need additional help, please call 1-800-322-1266. BREX
Answered by: BREX
Date published: 2017-12-12

I have had my filter for 2 days now it runs well but it is very noisy. Is it supposed to be noisy?

Asked by: Swantu
No, it should is fully submerged in water at all times, and this makes it quiet. Contact our Care Team at 1-800-322-1266 for help with this matter. BREX
Answered by: BREX
Date published: 2017-12-04

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: 2018-05-02

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: 2018-02-03

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
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ML90770 - 97gal/290 GPH