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AquaClear 50 Power Filter, Fish Tank Filter for 20- to 50-Gallon Aquariums (Packaging may vary)



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  • Aquarium filtration system that offers superior contact time with filter media and energy efficient pump lowers operating costs
  • Quick and easy installation; we recommend that you clean aquarium filter every 2 weeks for maximum operation and efficiency
  • Provides optimal mechanical; chemical; and biological filtration
  • Comes equipped with AquaClear Foam; Activated Carbon Filter and BioMax and Cycle Guard for superior water quality
  • Filtration volume is up to 7 times larger than comparable fish tank filters

Specification: AquaClear 50 Power Filter, Fish Tank Filter for 20- to 50-Gallon Aquariums (Packaging may vary)

Is Discontinued By Manufacturer


Product Dimensions

4 x 9 x 8 inches, 1.69 Pounds

Item model number


Date First Available

June 20, 2004


Rolf C. Hagen (USA) Corp.

Country of Origin


5 reviews for AquaClear 50 Power Filter, Fish Tank Filter for 20- to 50-Gallon Aquariums (Packaging may vary)

5.0 out of 5
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  1. Steward H.

    This filter produces amazing results with regard to water clarity. It is very quiet, and processes a very large volume of water. The three staged filtration is exceptionally effective. Our aquarium never had water anywhere near this clear!. Very highly recommended. Utilizes a large bag of very high grade activated carbon, along with a large filter sponge and a bag of biological media.

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  2. Greg and Vicky Gnepe

    My fish are clearly thrilled with this product! They remain alive despite my ineptitude and negligence. Whisper quiet design, my wife prefers this over my DIY 2-stroke aquarium pump, especially indoors.

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  3. PWadzinski

    This is my second purchase of the AquaClear 30 Hagen Power Filter (AKA: “Fluval 30”), the 10-30 gallon adjustable flow OTB filter. I have a 10G standard tank and a 20G high tank. This filter is ideal for both. It is dead quiet (I have both tanks in my living room) and I cannot tolerate motor noise or a constant hum (I have a really quiet air pump in the room as well!). It would drive me up the wall. So… quiet. Very quiet.

    This thing can run 150gph through itself. That’s turning over all the water in a 30G tank five times every hour. But, best of all, if you turn it down (and for a 10 or 20 you need to!), it recirculates water inside itself and refilters it many times before the waterfall. This is what they claim, and I think it’s true. Can’t prove it. So… plenty of suction.

    The part that holds the filter material in place (a sort of removable U-shaped shelf) can be easily removed while the filter is running if you take it slow, otherwise it gets a little sloppy. Same thing when you put it back. They provide you with filter stuff. My advice… keeping the big sponge is a must, that’s an integral part of the system, and then get yourself whatever filter media you like in bulk blankets. I don’t use charcoal other than when I need to clear some medication or something, so I use a dual-density very fine polyester mechanical filter (comes in mats, cut to size, good for years) as the “polishing” stage, then I have a bag of bio-rock matrix sitting on top just before the waterfall. Works for me. I cut what I need, and it’s lots cheaper than cartridges and all that. (This filter runs water from the bottom up through the various media and out the top for the waterfall. Bear that in mind when you stack things up.)

    Disassembly is easy-peasy. CAUTION!!!!!! When you take the pump assembly off (a quarter-turn, and it comes right off), do it over a towel away from anything where you can lose a small part. The impeller is right there, magnetically bound to it’s shaft. You need to remove it (tweezers, like that) and rinse out that chamber as well as clean off the impeller. It’s not THAT small, but you really don’t want to lose it down the sink! And, like all OTB filters, the U-channel that carries water over the back is hard to get clean. Get REALLY flexible tube brushes… 3/4″ and 1″ will to nicely. You have to get around a 90 degree bend. Other than that… nothing to complain about, and that’s a necessary design they all have.

    And last, it’s low profile. The entire unit sticks up about one inch (2.6 cm) above the tank. The little flow adjusting handle thingy protrudes another little bit above that, but the whole thing is very unobtrusive. Perfect for a display tank.

    The one thing I wish OTB filters had is an in-line ON/OFF switch and a disconnect so you don’t have to dig around and unplug it when you want to service it or just turn it off for feeding time. I can do that stuff myself, but if *I* want something like that, I bet lots of folks do. ::hint hint::

    Anyway, I love this filter.

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  4. Rick

    We’ve used this filter four years, just replaced with identical unit because of wear and tear (Cleaning). No issues at all, great brand of products.

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  5. JimmyBlues

    UPDATE: 10/15/14

    I have just purchased my first Aquaclear HOB filter in more than three years. I presently own an AC 110, AC 70, AC 50 and 4 AC 20s. These are great filters because of their clever design and tremendous flexibility.

    I am presently using a pair of Aquaclear 20 filters for polishing the water in my planted aquaria. The filters are equipped with a mechanical filter pad and a micron filter pad, the later of which is used to remove the finer particles from the water column in these tanks.

    I like using the AC 20s as part time maintenance filters because they are small, very easy to clean, and do an excellent job of filtering my planted aquaria.

    I use an AC 50 in combination with an Eheim 2211 and Cobalt Aquatics DUO 500 in a Mr. Aqua 17.1 gallon aquarium. The DUO 500 is an internal filter, however, its primary function is as an LED UV clarifier.

    I downsized some of my tanks, so the AC 110 and AC 70 are no longer in use. However
    I keep them around as spares, since you never know when you will need an extra filter.

    One of the best aspects of the Aquaclear line of HOB filters is that the motors in the AC 20, AC 30, AC 50 and AC 70 are the same. The only difference is that the impeller fan is slightly larger on each subsequent model of these filters.

    The fan can be easily removed, and either a larger or smaller fan (depending on the AC HOB filter that you are using) can be added to meet the demands of the particular aquarium you are using.

    This is why AC filters are so popular; their tremendous flexibility.

    For example, suppose that you have a 20 gallon aquarium and are using an AC 20 that doesn’t quite get the job done. You can purchase an impeller assembly for an AC 50
    and then use it to replace the AC 20 impeller fan, which will give you twice the circulation that you had with the AC 20 impeller fan.

    As another illustration using the inverse of this situation, suppose you are using an AC 70 in a 30 gallon aquarium and find that even on its lowest setting it is
    still causing too much turbulence for your fishes.

    You can replace the AC 70 impeller fan with an AC 50 impeller fan. This will still give you the filtering capacity of the AC 70, however, without the turbulence that the AC 70 impeller caused.


    My recent purchase of an Aquaclear 70 HOB (hang on back of tank filter) filter ill make this my 8Th Aquaclear. I have five Aquaclear 20’s – three on guppy tanks, and two kept as spares in the event of a breakdown. However, in over a year of constant service, I have yet to have an Aquaclear HOB filter’s electric motor burn out.

    Moreover, one must take care to turn these filters off when you are using a sand substrate which is being stirred up in the tank, since the sand can get into the motor and cause it to run roughly, or seize up.

    Even if this happens, all it usually takes to get these motors running again is to remove them from the filter housing, remove the impeller from the housing on the motor and clean the unit with water and a q-tip.

    Once you have done so, the motor will usually begin to run properly again.

    However, once sand gets sucked into these motors, it mars the finish of the impeller, which can cause it to make noise.

    I also own an Aquaclear 50 which I now keep on my 10 gallon tank, and an Aquaclear 110 which I use to filter a heavily planted 20 long tank with about 16 fish.

    So the extra filtering capability of the Aquaclear 110 is nice to have.

    As for the Aquaclear 70, this will be replacing the Aquaclear 50 which I used to filter my 37 gallon tank, and have now moved to my 10 gallon.

    The Aquaclear 70 will be used in conjunction with a Fluval 305 canister filter for redundant filtration.

    The Fluval 305, like the Aquaclear, is another Hagen product. It seems like virtually every product that is sold for the aquarist is manufactured by a subsidiary of Hagen’s.

    The 305 is also a very cleverly designed filter, which works quite well, and is very easy to maintain, thanks to Fluval’s patented Aquastop feature; the Aquastop fitting allows you to disconnect the 305 from its tubing without losing suction, so that you don’t have to reprime the unit once you’ve dumped the water from its container during a filter cleaning.

    All you do is reconnect the Aquastop fitting to the top of the 305’s canister, and then open the flow valve until the 305 fills with water.

    You must open the valve partially to avoid creating a tremendous amount of turbulance in your aquarium, since if you open it all the way while filling the 305, the air bubbles will race out of the 305’s exhaust tube disturbing your fish.

    As for the controvery between which canister is best, many people who consider the purchase of a Fluval also consider buying an Eheim, and there are those who own both. The Eheim – Fluval debate reminds this author of the Chevy-Ford controversy, regarding the merits of each.

    Moreover, I have owned both and find that Fluval and Eheim both make excellent canister filters. However, the Fluval’s internal setup is much easier to use, given the trays Fluval includes to add filter media to, while the Eheim Classic series (I’m not certain if the other Eheim filters are the same way) just stack the media atop one another, making for a more complex arrangement, since the Eheim’s filter media is in not in a tray.

    Both filters are well made and reliable. However, one must take care to re-lubricate the Fluval’s o-ring after each cleaning to ensure that it does not dry out, since this will prevent the unit from leaking onto your floor. And careful removal of the impeller housing will ensure that the impeller that does not get damaged.

    After more than a year with the Aquaclear series of filters, as well as the several months with a Fluval 305, I must say that I am very pleased with these units. They are cleverly designed, well constructed, and should last for years provided that they are properly maintained.


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    AquaClear 50 Power Filter, Fish Tank Filter for 20- to 50-Gallon Aquariums (Packaging may vary)
    AquaClear 50 Power Filter, Fish Tank Filter for 20- to 50-Gallon Aquariums (Packaging may vary)


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