MarineLandMicron Cartridge, Fits Magnum Canister Filters

Effective at keeping the water in my turtle habitat clean. Great price.

This filter insert does a fantastic job of removing suspended debris from my tank. I change it twice a week, using two filters in rotation. My first pair lasted one year. My best advice is to follow cleaning instructions, and do not use any mechanical means of cleaning. Don't use your fingers, a brush or anything. Just spray with water removing as much junk as possible, then soak in a 25% solution of chlorine bleach for about 24 hours. Then rinse thoroughly and air-dry. They look like new with this treatment.UPDATE:I have also learned that these filters age over time in spite of appearing to clean up quite well with chlorox. I find that my old filters work well for a week or more while the new ones show reduced flow and some filter noise after 2-3 days. Same tank and filter housing. I find that the new ones are filtering better, by not letting as much material through, thus they are loading up faster. This is actually what you want. The water is even cleareer as a result.Well, I thought if 24 hours soaking in bleach solution is good, how about 5 or 6 days. DON'T DO IT. The rubber on the filter starts to dissolve and become very sticky. Had to discard. Stick with the instructions! Don't do what I did.Still a fantastic product!!Good luck.

I use this Marineland Magnum polishing filter every time I clean the the tank and change water. The results are spectacular within the hour producing crystal clear water. The filter typically lasts for more than a year with a quick rinse between uses. Great quality and value for an integral piece of my aquarium maintenance.

Good for finishing filter, in addition to your other oneGot 4 stars because one I ordered fell apart, but only 1,have ordered 4

a little expensive

No problems, worked, was what it was supposed to be.

This is a great filter replacement. A few have said it did not fit the internal polish filter but they fit perfectly in my experience. After a few years I just replace them with a new one though nothing was wrong with the others. I will buy again.

I see some reviews had trouble priming this unit with D-Earth. I have used it that way about a dozen times and have not had any problem. I too used a 5 gallon container, and per instructions I filled the bucket with water high enough to cover the unit. Then turned the unit on and then put in 6 tablespoons of D-Earth (Harris Earth Food Grade). It took about 20-30 minutes before the buckets water was clear. I let it run an extra 20 minutes.I have found that you must handle the unit like it was filled with nitroglycerin when moving it from the bucket to the aquarium. The more it gets shaken the more D-earth will come out after you start it inside the aquarium. Expect some no matter how gently you handle it. Not to worry though, it will clear it up. At least it always did in my 70 gallon aquarium. I let mine run overnight each time.As for those who had problems. I can only guess that perhaps the washer placed on the inside of the filter that the cartage rests on was missing or not centered. Or the cartridge itself was defective or too much or too little d-earth was used.D-Earth increases water polishing significantly.