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 3.6 out of 5 by 28.
Rated 2 out of 5 by from Turtle Can this product be used even with turtles in my tank?
Date published: 2018-01-12
Rated 3 out of 5 by from Great product but gasket ring wore out very quick I’ve serviced aquariums for 10yrs but gasket didn’t hold up.
Date published: 2017-12-26
Rated 2 out of 5 by from Magnum Polishing Filter much needed parts I brought this filter and i liked it so much i brought another. I have a 120 gallon fresh water tank. Any way I would give this review 5 stars if i could only find out how to order parts. i also think that extra parts should have been provided seeing how quickly they become too worn during regular use. I loved it as long as it worked so know i wouldnt buy this product again if its not going to last over one year.
Date published: 2017-12-23
Rated 5 out of 5 by from Great filter I placed charcoal and marine fiber together and it works great !
Date published: 2017-12-18
Rated 3 out of 5 by from After 6 months I bought this 6 months ago and now the propellar has worn down and started to be very loud to the point i had taken it out of my fishtank. I cant find the propeller replacement anywhere.
Date published: 2017-12-16
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 this be used on a 5 or 10 gallon aquarium

Asked by: madelyn
No, it will not fit in either of those tanks. If you have a filter already, you can buy various types of media to help clear the water. There are polishing pads you can place in a filter system, as well as ion exchange resins such as Purigen. BREX
Answered by: BREX
Date published: 2018-06-11

Just where does the water enter the filter? From looking at photos, videos, reading descriptions & reviews, & looking at product in store, cannot find an answer, & would think is a basic thing to know...that would like to know before purchasing.

Asked by: Ricky41
This filter is operated by a powerhead, so it pulls water in through slits on the side of the shroud, and up through the turret. These are parts that are at the base of the powerhead. The shroud is also on the top and back of the canister body. BREX
Answered by: BREX
Date published: 2018-06-07

If I need to change the carbon in the filter once a month won't that get rid of the good bacteria? Also should I clean the sleve with tap water or in the water that I take out of the tank for water changes?

Asked by: Cory_J
No, it will not. Bacteria will be more built up on the sleeve as well as in the gravel, water, and on decor. Rinse the sleeve in water you take out of the tank. BREX
Answered by: BREX
Date published: 2018-06-06

I love this filter. Have had it for about a year. However, I need a new impeller and can't find the parts list or find one online. Help

Asked by: Mymakai
This filter uses the Maxi Jet Pro 1200 powerhead, so it takes the same impeller as that powerhead. http://www.marineland.com/Products/aquarium-parts/Power-Heads-and-Pumps/Maxi-Jets/Impeller-Assembly-for-Maxi-Jet-1200.aspx BREX
Answered by: BREX
Date published: 2018-05-29

Do you have a supplier in south africa

Asked by: Hannes
No, we do not export our products at this time. BREX
Answered by: BREX
Date published: 2018-05-29

My filter like the one pictured, is sucking water in around the the impeller cover at the top of the filter. Very little is going in the intake slot and pressure is low coming out. We have always kept it clean, replacing filters as needed .

Asked by: WMR1
Remove the impeller and make sure it doesn't have any buildup on it or hairlike strands wrapped around it. Also, clean out around the edges of the powerhead, and filter body to make sure you are getting a tight fit. Use white vinegar if you have hard water deposits. BREX
Answered by: BREX
Date published: 2018-05-23

The water being pushed from the filter used to be quite strong, now it is hardly moving at all, WHY?

Asked by: ConcernedCustomer124
Probably because the system needs cleaning out. You may need a new filter sleeve and new carbon or if you are using the micron cartridge, that may need replacing. And take the powerhead apart. Pull out the impeller and clean it, and inside the powerhead itself as well. BREX
Answered by: BREX
Date published: 2018-05-22

Where can I buy the replacement impeller? Is it part #ML90515-00? Amazon.com does not sell it. Can I order from you direct? Thank you for assisting.

Asked by: Dennij
The answer to both questions is yes. Here is a link to where it is on our site: http://www.marineland.com/Products/aquarium-parts/Power-Heads-and-Pumps/Maxi-Jets/Impeller-Assembly-for-Maxi-Jet-1200.aspx. BREX
Answered by: BREX
Date published: 2018-05-10

How often will you need to change the filters inside?

Asked by: James93
Each tank will vary, but a general rule of thumb is once a month. BREX
Answered by: BREX
Date published: 2018-05-07

Wat is the size of the micron filter cartridge? with and without being charged with diatomaceous earth, what is the smallest particle size that can be effectively filtered out? I want to polish my reef tank, but not filter out copepods

Asked by: Big C Jay
The smallest micron the filter will typically take out without DE is around 10 microns. We do not have any data regarding the smallest micron removed when DE is present. BREX
Answered by: BREX
Date published: 2018-05-01

How many amps does this use? Thank you

Asked by: sturgisfxb
0.38 amps, sturgisfxb BREX
Answered by: BREX
Date published: 2018-04-30

I am using this with the micron filter and set it up with Diatomaceous earth and it ran fine for a few days and since it seems to be blowing some of the powder out into the tank.

Asked by: muggle00
You aren't supposed to run it in this mode for a few days. It is no doubt clogged, and having issues keeping everything in it. Take it apart and clean it. If the tank isn't completely clear, then set it up again, but usually DE and a micron cartridge will clear a tank within a day at most, and should then be cleaned out. BREX
Answered by: BREX
Date published: 2018-04-29

I have a 60 gallon tank and I want to know if I only use this, would it put enough oxygen in the aquarium or would I need to add a powerhead or air stone

Asked by: Market D
That depends on the type of inhabitants, the quantity of inhabitants and your maintenance routine. As it uses the Maxi Jet 1200 powerhead as its motor, it really moves some water so you may not need any other form of oxygen. BREX
Answered by: BREX
Date published: 2018-04-25

Is this filter to big for my 30 gallon tank? Seems like a strong output for the tank. 

Asked by: Tonio21
Thanks for asking, Tonio21. Yes, this filter is a little too powerful for a 30 gallon tank. It is rated for up to 97 gallon tanks. We hope you find this helpful! For more help call Marineland at (800) 322-1266.
Answered by: Customer Service
Date published: 2018-04-21

How many gph should a salt water do?

Asked by: Eibar
If you are using a sump type of filter you want at least 700 gph. It is going to vary, depending on the size of the tank, type of inhabitants, etc. BREX
Answered by: BREX
Date published: 2018-04-10

How do you keep the flow diverter in place? I've tried everything I can think of but it just blows off when the filter is running. It blows my fish around the tank without being able to direct the water towards the surface.

Asked by: Beau2017
There is nothing on mine for it to snap into!
Answered by: bufurd
Date published: 2018-04-07

Does this filter need to be completely horizontal? It is a little taller than my water line. If I tilt it will it still work or burn out?

Asked by: Aovenaaa
Tilting it will cause the impeller to spin improperly and may wear it or the motor out. It needs to be vertical. As long as the bottom half of the powerhead is submerged, it's fine. BREX
Answered by: BREX
Date published: 2018-04-02

Why is my filter suddenly making noise

Asked by: Maine1
Well, without taking the filter apart, there is no way of knowing the answer to that question. Check the impeller, in particular, as it may have pulled something into it. Look for hair-like strands wrapped around it, sludge, hard water deposits, grit, etc. BREX
Answered by: BREX
Date published: 2018-04-02

How would you want to load biological media and carbon into the internal marineland Magnum filter does the bioballs go on the top or bottom when you put the cartridge in I'm using bioballs and carbon but don't know the best way to load it into the cartrid

Asked by: Cb4l
We would recommend putting the bio balls in first, on the bottom, then placing carbon in a mesh bag, nylon stocking, etc., and place this on top for easy access. BREX
Answered by: BREX
Date published: 2018-03-28

HOW DO YOU REMOVE THE MOTOR TO CHECK THE IMPELLAR

Asked by: DAVVIE
It basically twists off. Once you have it off, remove the powerhead from the "shroud". Twist the "turret" off as well, and this allows you into the powerhead to get the impeller out. BREX
Answered by: BREX
Date published: 2018-03-27

What voltage need this filter?

Asked by: RichieBroco
It is designed for 110-120 V. BREX
Answered by: BREX
Date published: 2018-03-27

I bought a Marineland Magnum Polishing Internal Canister Filter (ML90770) for my 40 gal. tank in January 2018. It has been making a lot of noise lately. What can be causing this? What can be done about it?

Asked by: Cindi46
Thank you, taking the head apart and cleaning everything did the trick.
Answered by: Cindi46
Date published: 2018-03-23

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 filters..one 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
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ML90770 - 97gal/290 GPH