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 23.
Rated 1 out of 5 by from Did little to nothing. Trying to rid my tank of a peskey algea bloom. This filter did next to nothing... Complete waste of money the tank was barely a little bit clearer... Followed all instructions properly and its really just not a good filter... Definitely going to return it to the store...
Date published: 2017-10-07
Rated 5 out of 5 by from Great Polishing Filter! Purchased the filter from Petco , easy to assemble. I'm using it to polish my water in my 72 gallon bow front tank . Has a strong output flow , seems to work well .
Date published: 2017-07-21
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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Can I use this on a 30 gallon tank or is it too powerful.

Asked by: BlueMatteo
That is going to depend on the fish, and the actual dimensions of this tank,but must likely not. There are different versions of the 30 gallon size, and some will be too shallow for this filter. Small fish would be blown all over the tank, but large cichlids or goldfish may be okay. BREX
Answered by: BREX
Date published: 2018-03-21

I followed the instructions, and its not working

Asked by: Homey70
Please call 1-800-322-1266 and we'll be happy to troubleshoot this for you. BREX
Answered by: BREX
Date published: 2018-03-21

What’s the difference between the water polishin filter and the two stage carbon filter?  They both come in the box, but what are the differences?

Asked by: Shant Z
The polishing filter is to be used alone, and it polishes the water by removing tiny particles that other types of media miss because they float right through those media. Carbon is a chemical media and it removes odors and discolorations from the water such as medication. The filter sleeve is your day to day filter pad and it removed the majority of debris, but the tiny particles float through it. Use the micron cartridge temporarily when you want crystal clear water or to remove tannins, algae, etc, from the water. BREX
Answered by: BREX
Date published: 2018-03-16

On the extension tube, what is the plug for? More specifically what is the plug hole for?  Thanks!

Asked by: tjd3
Are you supposed to take the plug out and attach something to it?
Answered by: KellyLucci
Date published: 2018-03-15

When I tried using diatom powder, I had the filter in bucket of dechorlinated water, and added 6 tablespoons of powder. It did not seem as if the filter was taking in the powder as the water remained very cloudy{in the bucket}.

Asked by: David 22554
In order to use DE powder you need to have the micron cartridge in the canister and completely submerge the canister until it pulls all of the DE into it. BREX
Answered by: BREX
Date published: 2018-03-13

Want to build a waterfall type filtration similar to the vivarium but more powerful. Can i use your filter and have the outflow as waterfall. I have a 40 breeder and two smaller semi-aquatic turtles. Can it be partially submerged for this?

Asked by: JacyPo72
You would need to have the tank full to about the base of the powerhead portion of the filter system for it to work. It would be better to buy just the Maxi Jet 1200 powerhead, and some vinyl tubing. Submerge the powerhead in the bottom of the tank, with tubing coming up and over the falls. You could perhaps have a manifold so that several short pieces of tubing come off the main one, and insert in between rocks, creating the waterfall. BREX
Answered by: BREX
Date published: 2018-03-12

Hello I purchased two of the magnum polishing internal canister was fine and the other on is missing the rear strainer where up slide up the mounting bracket with the suction cups..can i get that part??

Asked by: DAVVIE
Yes, of course, simply call 1-800-322-1266 and we'll take care of you. BREX
Answered by: BREX
Date published: 2018-03-18

I have had this filter since December 2017 and the impeller has broken. I can't find a government part. How do I get a replacement piece?

Asked by: Cynthia2324
Simply call 1-800-322-1266. Our Care Team can help you. BREX
Answered by: BREX
Date published: 2018-02-26

Hello Just set up 2 of these filters why on only one do i have airbubbles coming out of the outletb is still pumping well..Thanks

Asked by: davielock
That should have to do with the way you have them set up, as well as the depth they are installed at in the tank. Also, make sure the tubing and venturi knob are not clogged, and the knob is fully opened. BREX
Answered by: BREX
Date published: 2018-02-26

I currently use a fan internal on a 60 gallon tank along with a Eco-bio stone which works really well, but would like further cleaning of bottom was and cycle. Would this work and what is the best media? Ceramic? Charcoal?

Asked by: Tigger555
This will certainly do a great job filtering, but it doesn't clean the bottom, gravel vacuuming does that. It uses either a micron cartridge or a filter sleeve with carbon in a media container. BREX
Answered by: BREX
Date published: 2018-02-23

What micron size will this filter out. 

Asked by: Sfin52
It typically filters out around 50 microns, but can filter out smaller as it clogs. BREX
Answered by: BREX
Date published: 2018-02-21

Can this filter handle a 60 gallon tank. I am getting pretty fed up with my cascade 1500

Asked by: aprilc
That's a loaded question, aprilc! Yes, it is rated for up to 90 gallons and can handle a properly stocked and maintained 60 gallon tank. Emphasis on properly stocked and maintained. I don't know what issues you are experiencing with the Cascade 1500, but if the tank is over stocked or something, you may be requiring a second filter. Just wanted to give a heads up. This filter, however, is easy to install, maintain, etc. BREX
Answered by: BREX
Date published: 2018-02-16

I need an impeller for The Marineland® Magnum® Polishing Internal Canister Filter. I don't see one listed in your parts catalog. I've only had the Magnum for about a month. I ordered two impellers that were the wrong part number.Order# MLW4740744-468.

Asked by: Edmond
This filter uses the same impeller as the one for the Maxi Jet 1200 powerhead, ML90515, However, if the issue with the impeller is a manufacturing one, simply call 1-800-322-1266 for warranty help. BREX
Answered by: BREX
Date published: 2018-02-01

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: 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: 2018-02-03
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ML90770 - 97gal/290 GPH