Magnum 350 Canister Aquarium Filters

Product No. PC0350C
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The only filter of its kind with a patented flow through design, and self-priming, bottom-mounted motor. The Magnum® Canister Filters are the ultimate choice for both everyday utility filtration and water polishing.

The Magnum’s versatility gives the aquarist the ability to convert from a continuous duty mechanical and chemical utility filter, to a water polishing filter with micron filtration capability with ease.

All Magnums come complete with a Carbon/Media Container and Water Polishing Micron Cartridge. Available with, and without, BIO-Wheel® wet/dry filtration

Magnum 350 Canister Aquarium Filters is rated 4.15 out of 5 by 40.
Rated 5 out of 5 by from Best for keeping your tank/fountain/pond clean I have been using Magnum 350 canister filters since 1985. There was a predicessor back then. I still have 4 of them in operation. 2 on a 135 gallon tank. The water is crystal clear, one on a large out door fountain that I keep gold fish in. I replaced the regular fountain pump with the magnum 350 filter and it keeps the fountain crystal clear so you can see the fish. And I just put in a small fish pond (liner) 10 foot by 4 foot x 2 feet deep. I had an older Magnum sitting around because I took down an aquarium when my son went to collage. It is working great. The magnets need replacing about every 8 years but that is expected for a moving part. Great Product. I recommend it. If you don't want too much maint. of your tanks you have to put the money into the proper filter.
Date published: 2016-04-01
Rated 5 out of 5 by from This guy is an idiot 1 - I've never use zip ties to to tighten the foam filter to the carbon basket. That is just silly. Just buy the proper filters for you filter and you can reuse them! It's actuality cheaper and beneficial.2 - Rinse the used foam filter in luke warm water but do not flush or squeeze all the bacteria from the sleeve. It is beneficial if you want to reuse the sleeve, which I do. If the filter is going to be reused in several different tanks (drain the canister and refill with the tank's water). Unless there is a major problem (infection or disease) this will have no adverse effect on the tank your are cleaning. Especially useful on new tanks or major water changes. Bacteria is our friend.3 - Always perform water changes in the amount you are comfortable with (3 or 4 gallons weekly), or on bigger tanks, maybe a quarter of the volume of the tank. But it is still better to replace a smaller amount more often that all at once.4 - I use the sleeves up to 3-4 times on several tanks weekly and I buy the fitted foam sleeves because they fit and aren't that expensive! Considering the investment that you have made in your tank(s), cutting corners for a buck or two just doesn't make sense.I have using a Magnum 330 for years, but it finally gave up the ghost. If you read this and have parts you would like to part with, please let me know. I'm probably going to up-grade anyway, but keeping a back-up filter in emergencies is gold.Dana
Date published: 2016-03-28
Rated 5 out of 5 by from Marineland-Magnum 350 Canister Filter I bought one of these years ago! It is hands down the best filters system that I ever owned! I wish that I could find a new one!
Date published: 2016-03-27
Rated 5 out of 5 by from Excellent Canister Filter Then and Now I had a Magnum 350 canister filter when I first got into saltwater tanks back in 1994. It was an excellent design then and still is now. Through the years I have been lured into other filtration systems, but after 22 years I decided to go back to my roots and buy a new one. Nostalgic, I know. But I had a great time setting it up and it took me back to the early days of my hobby. This is a no nonsense canister filter that does exactly what it's supposed to do. I hooked it up to a UV sterilizer on my 120 FOWLR and I love opening the cabinet to see it standing there dependable and strong, supporting me aquarium. Easy to clean, quiet, and it just lasts. Please keep this filter around for many years to come because it is a gem of the hobby for both fresh and saltwater use.
Date published: 2016-02-28
Rated 4 out of 5 by from Only dependable diatom filter on market. The weak point is the hinges on the canister, plastic always cracks
Date published: 2016-01-24
Rated 5 out of 5 by from Best filter owned! Marineland is awesome!!! I've used the penguin series on my smaller tanks and then upgraded to a 90gallon for my cichlids and bought this and have no regrets!! Thank you!
Date published: 2015-10-26
Rated 5 out of 5 by from Great product This filter system comes with everything you will ever need including cut off valve and clamps, hose clamps and mounting for almost any tank. Mine is 5 years or so old and works great no leaks, motor runs fine and pumps like new. If you can find one you will be very happy.
Date published: 2015-10-05
Rated 5 out of 5 by from Been using this product over 15 years I originally bought this product to use with Diatomaceous earth material as a water polisher. i have used this product on both fresh water and salt water. It is easy to maintain and even easier to use. i currently use this on a 45 hex with charcoal canister along with a under gravel filter. and every few months will load the micron filter and Diatomaceous earthto polish the water in all my tanks. recently purchasing another unit with BIO Wheels to run on my 20 Long tank as its sole filter. i highly recommend this for both filter and water polisher.
Date published: 2015-06-21
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I have one. Its great. Looking for another one. Where can I get one?

Asked by: Debbers
Unfortunately, this item has been discontinued and is no longer available.BREX
Answered by: BREX
Date published: 2016-04-27

what is the price for the 350 system

Asked by: rusty o
Unfortunately, we do not sell direct, and that particular filter is discontinued. It was a recent discontinuation so you may still find it in some small fish shops.BREX
Answered by: BREX
Date published: 2016-04-26

Can the magnum 350 be used in a salt water tank? 

Asked by: Jer7305
Yes, you can definitely use the Magnum 350 or any of our canister filters with a marine aquarium. Keep in mind you will need to clean the impeller and motor region with vinegar every month or so to keep salt creep and Ca++ deposits from forming.BREX
Answered by: BREX
Date published: 2016-04-25

Where can I find the gaskets for a Magnum 300 .

Asked by: Spotch
If you meant Magnum 350, they are available through our site: http://www.marineland.com/Products/aquarium-parts/Filtration-Products-and-Skimmers/Magnum-Parts/Rubber-Gasket-Set-for-Standard-Magnum.aspx.All Magnum filters are discontinued items, but we still have some parts left.BREX
Answered by: BREX
Date published: 2016-04-22

What gallon take is this ment for? I have a 75 gallon tank and I want to make sure that this filter will keep it clean enough. 

Asked by: Hannah123
Up to 100 gallons. With larger aquaria, if you are heavily stocked, it is a good idea to have more than one filter on the tank, but this particular canister does an excellent job of filtering large amounts of waste in big tanks.BREX
Answered by: BREX
Date published: 2016-04-18

We have 3 Magnum 350 canister filters cleaning two 80 gal freshwater turtle tanks and a 160 gal freshwater pond tank. We have been replacing the filter sleeves and the carbon once a month, but we are wondering if it is possible to rinse and reuse both?

Asked by: jlbilger
You do not want to rinse and re-use the carbon as it will be used up prior to 4 weeks. Rinsing it will not help. However, the filter sleeve can definitely be rinsed and re-used many times, and last up to a few months, depending on wear and tear.BREX
Answered by: BREX
Date published: 2016-04-14

how much will the magnum flow?

Asked by: hillbilly
350 gph.BREX
Answered by: BREX
Date published: 2016-04-11

I just acquired a magnum 350 filter. If I was to reduce the flow rate, would it be okay to use on a 20 gallon tank? 

Asked by: Mike22
That would depend on the type of fish you have in the tank. You can only restrict the flow rate by about 30% before you begin to stress the system. If the fish are large enough to handle approximately 250 gph, then it should be okay. The diffuser on the outlet allows you to do some reduction of flow rate.BREX
Answered by: BREX
Date published: 2016-04-04
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Magnum 350 Manual

Magnum 350 Quick Set Up Guide




Product Flow Rate Aquarium Size
Magnum 350 350 GPH up to 100 gallons
Magnum 350 Pro 350 GPH up to 100 gallons