Maxi-Jet® Multi-Use Water Pump

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Product No. ML90509-01
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Maxi-Jet® multi-use water pumps are three pumps in one: power head, utility pump, and now featuring a circulation pump option.  Still the best power head for powering undergravel filters and running wave maker timers, as well as for running small fountains, calcium reactors and skimmers. 

The Maxi-Jet also contains an in-box conversion kit, which can turn the power head into a prop style circulation pump for ultimate water movement inside the aquarium--using the least amount of energy!  The Maxi-Jet is the most fully adaptable pump available.

Maxi jet 900 External configuration

I would like to use the pump in an external configuration but I don't see how the tubing will hold on the stubby stepped inlet. It seems as if the tubing will slide off over time even with a clamp. Is there another attachment sold separately?
Asked by: Matt001
No, there is no other attachment. Teflon tape or hose clamp is recommended. BREX
Answered by: BREX
Date published: 2015-11-02

new maxi jet 400 won't turn on

ok - how dumb is this: I assembled the circulation pump for laminar flow (option B), submerged it in the tank attached to the wall with suction cups, and was disappointed when I plugged it in that nothing happened. I'm brand new at this. What am I missing?
Asked by: Fishless
Here's a dumb question, did you insert the propeller? If not, well then.... :-) If so, try pulling it out and re-inserting it. They are sneaky little things that will sometimes not stay in. BREX
Answered by: BREX
Date published: 2015-12-28

does the old style impeller, 0045008, fit the new maxijet 600 pro?

Asked by: roberts
No it does not. BREX
Answered by: BREX
Date published: 2015-10-08

Is there a built in timer ion Marineland Mj400

Having issues with current pump and not sure if it needs replacing or if there is some time delay built in
Asked by: Donwan
No, there is no built in timer in any of our powerheads. Try removing the impeller and soaking it in distilled white vinegar for about 10 minutes. Soak the powerhead separately, as well. BREX
Answered by: BREX
Date published: 2015-09-23


I need to replace a Marineland NJ1100 for my UV Sterilizer. Which model would be the equivalent? Thank you.
Asked by: RGinFB
The pump that would be the closest in flow rate would be the Maxi Jet 1200 Power Head that you can convert into a circulation pump. MINI
Answered by: MINI
Date published: 2015-08-17

is this unit used as alternative to simple air pump for 20 gal

20 gal guppy tank, overstocked. Have HOB filter with Tetra 77853 Whisper Air Pump, 40-Gallon. Does this unit replace the air pump, and will I still need the filter?
Asked by: retired
It can, yes, although it mostly circulates water, it does not provide oxygen like the air pump. And yes, you definitely need the filter system. This pump may be a bit strong for guppies. You could add a prefilter onto the inlet to help filter the tank, and slow the flow down. Use the venturi to provide oxygen. BREX
Answered by: BREX
Date published: 2015-07-24

new Maxi-Jet 900 is very loud??

Just installed brand new Maxi-Jet 900 and it's very loud. I'm using it for circulation with the laminar flow head on I've tried taking it part and reset the long propeller and I've tried putting it in different positions for a better result but to no avail
Asked by: dreadhead
In the circulation mode, it will be loud for approximately 10 seconds as it starts up. After that, it should be quiet. Additionally, it is not intended to have anything attached after it. BREX
Answered by: BREX
Date published: 2015-07-20

Will the maxi jet 1200 attach to the sea clone 100?

Is it the same as the one that comes with a SeaClone 100 protein skimmer?
Asked by: Don13
Yes, and no. It is the same powerhead, but the one with the Seaclone comes with an adaptor that the powerhead alone, does not. If you have the adaptor, you can buy just this powerhead and connect it. BREX
Answered by: BREX
Date published: 2015-08-24

Is it possible to attach tubing to the Maxi-Jet Aquarium Power Heads?

I want a pump that allows me to attach a tubing to suck sea water from a 200 lt tank to another 200 lt tank.
Asked by: Ines
Yes, you can remove the diffuser and connect tubing, but it will only work this way if it sits in the bottom of the one you wish to remove water from, and then has tubing attached to the outlet end and extending into the second tank. BREX
Answered by: BREX
Date published: 2015-06-25

What powerhead go with this?

I have a 280 gallon want it for aeration,Maxi Jet 600 or 1200..?
Asked by: Rjpp
For that size tank, if you want just one or two, I would use the Maxi Jet 1200. BREX
Answered by: BREX
Date published: 2015-06-08

What size circulation pump should I use in a 55 gallon reef tank?

I have a 55 gallon saltwater tank with a Maxi Jet 600 in it. It almost seems like too much current, but I am not sure since it is going to be a reef tank. Is a Maxi Jet 600 too much? Should I use a smaller or larger model?
Asked by: T54Jones
This should not be too much movement for a reef tank. I have known hobbyists to put the MJ 1200 in smaller tanks for this purpose. Keep in mind that reefs are pounded by waves going back and forth so your circulation should be pretty powerful. One at each end, facing different directions and at different heights would be good. If you do have fish that are struggling, try going down to the 400, but still have one at each end. Additionally, if the fish are of good size, you may have stressed or weak fish and need to take a look at why that is and what needs to be changed. It is not always about water quality either Diet and lighting are very important to marine fish. BREX
Answered by: BREX
Date published: 2015-05-06

What size Maxi-Jet Pro would I get for my 20 gallon aquarium?

Asked by: Lydd
Depends on what you wish to have it do for you, but the 400 would be my recommendation. BREX
Answered by: BREX
Date published: 2015-05-02

Which MaxiJet Powerhead model is adequate for a 75 gallon freshwater aquarium?

Asked by: Sonnyd52
That depends on what you hope to achieve with it. If you just want some water movement, the 900 or 1200 would probably be best. BREX
Answered by: BREX
Date published: 2015-04-27

does this pump work well for an outside waterfall?

Building a waterfall going into a pond nothing huge would this pump work well for that?
Asked by: jessicaschader
not real great for high head pressure
Answered by: sbreefer
Date published: 2016-01-09

Is the Maxi-Jet 400 adjustable so that I may turn down the volume of water being pushed thru the tube for a small indoor fountain?

Asked by: Mamaria
Answered by: sbreefer
Date published: 2015-08-08

recommended height

Can you recommend a proper height for maximum output from my 400? It is presently about 8ins from the bottom the trap to the bottom of of the intake is 3ins from my substrate at the bottom of the tank .Yoir advice would be greatly appreciated.
Asked by: lesty
That depends on what you wish to do with it. If you are just trying to circulate water, the propeller would be the best method for maximum output. As far as where it is in tank, it will not make much difference. If you want air bubbles, it needs to be no more than 2" below the water surface. BREX
Answered by: BREX
Date published: 2015-02-03

overhead filter

Hi I am from trinidad & tobago .I recently bought a maxijet 400 for my 70 gal discus tank I am useing it to pump water to my overhead filter will it do the job perfectly ?And does the height you have the powerhead affect the volume of water that is pumped to the filter ?
Asked by: lesty
Yes, it can do this type of job, no problem. And yes, the height affects how much flow you will get from the powerhead. BREX
Answered by: BREX
Date published: 2015-02-02

maxi-jet 400 aeration

i have my maxi-jet 400s submerged about 6 inches into the water, but still want aeration through them. Is it acceptable to attach tubing connected to an air pump to the air intake to force bubbles through it?
Asked by: dmc10
No. At the least, that would make a lot of noise. Worse case scenario is the bubbles would interfere with the impeller. BREX
Answered by: BREX
Date published: 2015-01-12

Does the MaxiJet 400 come with UG filter (sponge filter) attachments?

In the manual (on your product page), the replacement parts list implies that the accessory kit ML90523 does not come with MJ400. Can the 400 be attached to a 1" OD thinwall lift-tube?
Asked by: Justin73
The Maxi Jet 400 comes with all of the same items the others do, but in a different size in the some cases. The undergravel adaptor which we sell on our website fits all models, including this one. It is a universal barb so yes, it would fit the 1" o.d. BREX
Answered by: BREX
Date published: 2015-01-22

I just bought a maxi jet 400 to go in fresh water 35 gal high tank with u/g filter with tubes. At first the pump was noisy and seemed to be cavataing

Unit seems to cavatate and is noisey. There was some aeration too. I removed pump from aquarium and placed in bucket of water and unit seem to work. Then I reinstalled in aquarium but again it was noisy and no air with tube open and not kinked. Finally got pump to run quiet but no air . Unit is brand new and is about 1. 5 inches below water surface. Help Jack
Asked by: vzhmcv
Hello Jack, Try pulling the impeller out and re-seating it. Make sure you are using the impeller and not the propeller. Remove the intake tube and check for flashing or anything else that may be clogging it or the venturi as well as the little port that it connects to. BREX
Answered by: BREX
Date published: 2014-12-01

stop working

Hi I have a Marineland power head, the power went out in my house and the power head stop working is there anything I can do to fix it
Asked by: francisco
Most likely all you need to do is take it apart, and clean it, paying close attention to the impeller itself. You may even need to use distilled white vinegar if you tend to have hard water or have a marine tank. If it still will not start, the power surge from the power coming back on may have damaged it. BREX
Answered by: BREX
Date published: 2014-11-19

Maxi-jet 1200

A year or so ago I purchased 3 of these pumps to be used in a wall fountain. They pump fine (pumping upwards 51 inches) but a very noisy, buzzing sound. I have tried different way of quitting them down but nothing has worked. It seems that one is more noisy than the others. DO you have and idea's on what I could do??
Asked by: jahas01
Try soaking them in distilled white vinegar. Also, the units should be plugged into a power strip with surge protection to avoid voltage issues. It sounds like they are receiving weak voltage from your line. BREX
Answered by: BREX
Date published: 2014-11-14

Which Maxi-Jet is best for a 90gal

Interested in increasing the circulation in my tank. A friend lent me his 1200 but it's seems like it's too powerful.
Asked by: Cam2112
Depending on the type of tank it is (reef vs. freshwater for example) and where you wish to place the powerhead, I would recommend the 900 model. Alternatively, some people like to use two smaller powerheads, such as a 400 at each end, and have them located at different heights as well. BREX
Answered by: BREX
Date published: 2014-09-08

I bought a Marineland Powerhead 1200 to use asa powerhead that blows air. It works fine right out of the box

So I bought another Marineland 600 Powerhead to Blow air also to get rid of the noisy air pumps and air stones I had in all of my tanks. To my surprise I set it up the exact same way out of the box, and cannot get it to blow air at all. I can take the valve off the end of the rubber hose and blow in it and air goes all the way through to the end of the powerhead, but it will not function as a power head on it's own. Ironically, I also was given a marineland 400 Powerhead from a friend with a plug in the air tube hole which I purchased the air tube and valve assy accessory for and it too will not function as a power head. I'm tired of trouble shooting this hing and plan to take it back to the store to get another PH 1200 Pro that I hope will function correctly right out of the box. Do you have any ideas?
Asked by: FishyDad
Make sure the powerhead is no more than 2" below the level of the water. There should be no kinks in the tubing, and it should not be excessively long. Make sure the knob adjusts properly. Check the impellers, and make sure they appear undamaged. The amount of air produced is a direct reflection of how much power is being produced by the impeller. Usually, in this situation, we send out a new venturi kit and that seems to resolve the issue. BREX
Answered by: BREX
Date published: 2014-08-29

My Maxi Jet 1200 suddenly stopped working. I cleaned it but it still does not work. Please advise.

Asked by: Magnum
Soak the unit in distilled vinegar for about 20 minutes, rinse well with warm water, and try it again. Check the impeller for any scarring, warping, breakage. If you cannot get it up and running, you would need to send the unit back to us, along with your receipt. BREX
Answered by: BREX
Date published: 2014-08-15

the circulation pump.

I believe my circulation pump motor has burnt up, and I have not let it run dry. It at first did fine for my saltwater tank for a few months but then it started to act funny and a few months after that the pump quit working. It did well in my tank but since it went out I have had a large cynobacteria bloom. What should I do about my pump
Asked by: orchid1
Remove the pump, take it apart, and thoroughly soak/clean everything with distilled white vinegar. This should be done at least every couple of months on a regular basis. BREX
Answered by: BREX
Date published: 2014-08-15

What is the maximum recommended temperature of water for the Max-Jet pumps?

I am planning a Tropical tank for fish that need high water temperatures. What is the maximum temperature that you recommend.
Asked by: Squirejoe
Anywhere up to 90 degrees should be fine. BREX
Answered by: BREX
Date published: 2014-07-24

how long should i leave my circulation pump for?

I have a55 gallon freshwater planted aquarium i was sure if i should leave it on 24/7 or only for a certain period of time. I have the maxi-jet 630400
Asked by: Toadsfreshwater
This really depends on why you are using a circulation pump, but in most cases you want to leave it on 24/7. BREX
Answered by: BREX
Date published: 2014-07-22

Venturi aeration not working

Hi, I have 3 different maxi-jets - a 400, 600, and 1200. I have had different combos of 2 of the 3 in my 55 gallon freshwater tank with UG filter. I was able to fiddle with the 1200 to produce aeration at certain angles and in certain directions, however, the fish didn't like the flow in that direction and eventually I moved it to the other tank. I have tried multiple times and multiple adjustments of the 400 & 600 venturi setup. When they first arrived I was able to find an angle or adjustment that would produce some aeration, but now I cannot. I have cleaned both, they are not clogged, the tops of the unit are close the surface (1/4" and 1"), and the tube is appropriately outside the tank. I tried replacing the black tube with a clear one to see what is happening. I see that the water level in the clear tube fluctuates and comes close to suck in air (1/8") but cannot. Moving the 1200 to a 15 gallon tank with under-gravel makes the venturi go wild, but those fish love the movement. I've read the other Q&A and have tried all the things you suggest. Why is the aeration not working for me?
Asked by: discus
If the UG is clogged, the flow of the water could be reduced substantially enough to prevent aeration from occurring. Same goes if the powerheads themselves are dirty or have any debris/buildup. BREX
Answered by: BREX
Date published: 2014-07-16
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ML90509 - Maxi-Jet 400 - 110-500 GPH
ML90510 - Maxi-Jet 600 - 160-750 GPH
ML90511 - Maxi-Jet 900 - 230-1000 GPH
ML90512 - Maxi-Jet 1200 - 295-1300 GPH

 Maxi-Jets Manual


Power Head Mode 

Circulation Mode 

Utility Mode 





Max Head Height 

Maxi Jet 400 






Maxi Jet 600 






Maxi Jet 900 






Maxi Jet 1200