AquaC EV-400 Protein Skimmer With Iwaki MD55RLT Pump

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The revolutionary AquaC protein skimmers do not use venturis, downdraft tubes, or air pumps; they employ the patented "Spray Injection System." This innovation allows the protein skimmer to efficiently draw in much more air than any other of the top protein skimmers. This coupled with the superiorly designed compact reaction chamber yields results that will literally blow the waste out of your water.

How does Spray Injection Work?

In 1998, Jason Kim (owner and founder of AquaC) developed a patented process of protein skimming which has come to be known as Spray Injection. Unlike previous forms of skimming, our spray injection method enables huge amounts of air and water to be processed with a relatively small pump. Although it is a simple process, there is still some confusion as to how the spray injector works.

Imagine that you`re washing your car – you`ve got a bucket full of soapy water and a garden hose with a fast-moving stream of water. By placing your thumb over the end of the hose, you can disrupt the stream into a turbulent, high –pressure spray. Now direct that spray down into the bucket of water, and you`ll generate a massive amount of bubbles and air flow. That is exactly how our spray injector works.

The skimmer body acts as a water reservoir – the bucket in the example above. Water is pumped through the spray injector, which has a special nozzle that fans the water out into a pressurized spray. This spray shoots into the skimmer body, generating millions of tiny air bubbles. As the bubbles are formed, more air is sucked into the skimmer as a result of the local drop in pressure and the process continues.

Most other forms of protein skimming rely on special valves or media to generate the air flow, and these parts quickly become clogged with salt, dust, or even mineral deposits. The AquaC spray injector is a relatively large nozzle that resists clogging, and when combined with a pump prefilter, can be considered maintenance free.

The redesigned and improved EV Series skimmers raise AquaC`s spray injection skimming (U.S. Patent # 6,156,209, #6,436,295) to a new level in terms of efficiency, performance, and value. A new baffling system combined with a significantly larger mixing box results in far less turbulence and increased contact time. The net effect is a dramatic increase in skimmer performance despite a drop in pump pressure requirements. AquaC`s molded spray injector now generates a significantly larger number of microbubbles, boosting overall performance to unbelievable levels considering such low pump pressure requirements.


  • Flexible design for in-sump or external applications.
  • The new EV Series skimmers are designed to run in sumps WITHOUT BEING RAISED. The output gate valve has been increased to a height of 10" (EV-120/180 models), which means that as long as your sump level is 9" or lower you will not need to worry about fluctuations having an impact on skimming consistency. The powerful EV-120 can sit in water as deep as 9".
  • The addition of a precision ball valve for airflow control allows the aquarist to fine tune the skimmer`s output. Unlike most other high performance skimmers in this class, the EV is remarkably silent. The spray injection system does not generate the sucking noises typical of venturi and Beckett units.
  • The John Guest "Speedfit" fitting is a great feature you will only find on AquaC ozone-equipped skimmers. This fitting is standard on models EV-240 and above, and can be ordered on the EV-120/180. Aquarists may also connect their calcium reactor effluent line to the skimmer`s speedfit connection. The pH of a calcium reactor effluent typically falls between 6.5-6.9, and over time the addition of this low pH effluent can have a deleterious effect on the system`s pH level. By dosing your effluent directly into the skimmer, excess CO2 will be "blown off" into the atmosphere and the tank pH will remain unaffected.
  • The improved "Twist-Lock" collection cup and cap makes for a secure, flanged connection without the need for set screws or other locking type unions. Simply twist to crack the seal (EPDM gaskets) and removal requires a scant ¼" clearance. The new EV Series skimmers can be operated with AquaC`s auto-waste container, which are available in 2.5 and 5 liter sizes.
  • Increased contact time = more protein removal. The size of the mixing box has been increased on all models by approximately 40%. To accommodate the extra foam the skimmers now feature taller and wider reaction towers, as well.
  • Height: 32"
  • Recommend Pumps: Gen-X/ Mak 4, Iwaki MD40RLT, Iwaki MD55RLT, Mag 18 or 24
  • Footprint: 6.75" x 10.75"
  • Foam Tower: 6" OD
  • Tank Size: 150-400 Gallons
  • JG Fitting: Standard 1/4" JG fitting
  • Bubble Size: .03–.05mm
  • Water flow-thru rate: 700gph
  • Volume of foam produced: 475cu.in.
  • 1" hose barb water input
  • 1-1/2" gate valve output
  • 3/4" collection cup drain
  • 3/8" threaded air inlet
  • Gate valve exit is 9-1/2" high

Iwaki MD55RLT Specifications
  • Flow Rate @ 4` Head: 1080 GPH
  • Inlet(MPT)/Outlet(MPT): 1"/1"
  • Max Head ft: 26.9
AquaC EV 120/180 Protein Skimmer AquaC EV 240 Protein Skimmer
EV 120/180 Skimmer EV 240 Skimmer

AquaC EV Protein Skimmers Comparison
Description Tank Size
Pump Height Footprint Foam Tower Volume
EV120 40-120 Rio 2100 
Mag-Drive 5
18" 4.75" x 8.5" 90 cu. in.
EV180 75-180 Rio 3100 
Mag-Drive 7
20" 6.0" x 9.2" 135 cu. in.
EV240 100-240 Mag-Drive 12
Iwaki MD40RLT 
26.2" 6.9" x 10.5" 320 cu. in.
EV400 150-400 Gen-X / Mak4 
Iwaki MD40RLT 
Iwaki MD55RLT 
32" 6.75" x 10.75" 475 cu. in.
EV1000 350-1000 Iwaki MD70RLT  32" 9" x 12" 750 cu. in.
EV2000 up to 2000 Iwaki MD100RLT  42" 9" x 12" 1100 cu. in.

AquaC Protein Skimmers in Use
This is one reef aquariums where the AquaC prototypes are tested on.

AquaC EV90

At the time of the picture, this aquarium had been running with an AquaC EV90. Note that this aquarium is fairly heavily stocked. After this picture was taken, quite a bit more livestock has been added to this aquarium. Currently, an AquaC EV150 is running on this well-overstocked tank. AquaC feels that this the EV150 is probably not neccessary for the tank, but they feed their tank quite aggressively to keep all the fishes that has been added healthy and wanted to keep maintenance at a minimum. According to AquaC, maintenance on this aquarium has been extremely low.

The AquaC EV-150 protein skimmer working on our aquairum:

AquaC EV150

Please note the dry consistency and quantity of the foam being collected by the AquaC protein skimmer. This drain cup is being filled on a daily basis. There is a convenient collection cup drain connector that allows you to drain the the waste collected in collection cup into a waste container.

This particular model stands only 20" tall, so it is extremely easy to place this skimmer underneath most aquarium stands. Even the model EV200 fits very easily under most aquarium stands.

The AquaC EV skimmer working in one of our customer`s tank:
AquaC EV Skimmer

Manufacturer Info

AquaC Aquarium Supplies
AquaC was founded in 1998 as a small one-man operation in San Diego, California. The company has since grown to become one of the leading protein skimmer manufacturers in the United States and sells thousands of units globally every year. AquaC`s 5,000 square foot production facility in San Diego sets the standard in technology for acrylic fabrication. They use precision CNC machined parts and advanced thermoforming techniques to build products of unmatched quality and value. The company`s focus has remained the same after more than a decade in business: to provide high-quality products and top-notch customer service to customers with each and every transaction.


Manufacturers Warranty (Skimmer): 90 days from date of purchase

17 Reviews



Experience Level: Expert

great customer service

first one i received was damaged, but they sent out a new one immediatly. great customer service

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Experience Level: Expert

As good or better then my delt

I have a recirculating deltec and this skimmer. They are both excellent skimmers. I run a 350 gallon reef system and can not tell the difference in the quality of the skimmers. The one thing that I love about the ev400 is the price of the pump. I had to buy an impeller for my deltec and it was $250. It also uses a feed pump. The MAG18 on my ev400 cost me less then $150 and the impellers are cheap. Love my Deltec, Love the ev400 more!!!!!

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Experience Level: Intermediate

Great Skimmer

I have this on my 220Gal Reef with a Sicce 10 on it and after the breakin this skimmer pulls 1/2gal of nice dark green skim a day. very easy to setup just take your time with it. AquaC is a great skimmer if you don't have alot of room or want to hear all the noise from Recirculating pumps.

0 out of 1 found this review helpful

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Experience Level: Expert

Mag18 ISN'T enough!

I got this skimmer to replace my RedSea C-Skim 1800 on my system. (Moved that to my mantis tank) Quite a few reviewers have stated that the Mag18 just doesn't cut it to drive the skimmer efficiently enough. ENOUGH is the KEY word here. It does produce skimmate, but the threshold between bubbles & filling the reaction chamber with water is minescule. I only have a 1' section of tubing going from the pump to the skimmer. There are no sharp bends in the tubing. I'm going to get either a Mag24 or QuietOne 9000. I'll be able to use the Mag18 for another project. My advice to any buyers... BUY THIS SKIMMER! DO NOT trust the reviews stating that the Mag18 is enough. The folks who THINK it is have NO idea how much more effective the thing will be once it's being driven properly.

7 out of 8 found this review helpful

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Experience Level: Intermediate

Excellent Skimmer

First - this skimmer will not operate at peak efficiency with the Mag 18. I am not sure why they would recommend it. You must use the Mag 24. I skim very wet - about 5 gallons a week of skimate. This is part of my water change schedule and this skimmer is perfect for that function. This skimmer is a set and forget and performs flawlessly. Very easy to clean.

3 out of 3 found this review helpful

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Experience Level: Intermediate

Best Skimmer Ever

Works great...a cup full of gunk 1 hour after dialing in. My only complaint is that the description said can run in up to 11" of water, and the bottom of the outlet is 9.5".

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Mike from Topeka, KS UNITED STATES


Experience Level: Intermediate


I like simple. This skimmer is simple. I ran the collection cup hose to an old 5 gallon salt bucket I had sitting around, drilled a hole in the lid, sealed it with a little silicone and skiped the fancy overflow container. Dump it once a month. Yummy. I got the EV400. It's a bit big for my system which is a 90 gal display but about double that in total system water. I had it set-up and running within an hour after it was delivered. The next day I had reasonably good skim-mate. And the more it gets broke in the better it works. Some say the MAG18 isn't enough and to use the MAG24. I got the MAG18 and its just fine. People use the word "dialed it in". Eh, one dial. Its the gate valve handle. 'bout two minutes of fiddling with it to get the column of bubbles at right height and its "dialed in". VERY happy with this purchase. Simple.

2 out of 5 found this review helpful

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Experience Level: Intermediate

One Powerful Skimmer

The AquaC EV-400 protein skimmer was very easy to set up and I would estimate that I had the unit out of the box and up an running in 30 minutes. I would encourage everyone to pay careful attention to the instructions related to the break in period. When I first turned on the skimmer it instantly started producing foam and overflowed and the instructions indicate to let the overflow return to the sump which I did. It took about a day to day and a half for the skimmer to complete the break in period and then it started producing very thick clingy foam and very dark skimmate. The unit is sensitive to changes in the water chemistry causing the entire column of foam to withdraw as I saw this happen when I changed the filter sock that I am using to eliminate microbubbles in my sump tank. When this ocurred within a few hours the unit was back fully charged with foam producing skimmate.

1 out of 3 found this review helpful

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GREG from Clarkesville, GA UNITED STATES


Experience Level: Intermediate

It's a beast

I just got my skimmer and once it was cleaned, assembled, installed and dialed in it started producing skimmate in minutes. The spray injector really churns the water to a froth. It produces quality skimmate. I am glad I made this choice.

1 out of 1 found this review helpful

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Experience Level: Intermediate

Best I ever used!!

Hooked up about 2 months ago and have loved it ever since!! May cost a bit more than some other skimmer, but the simplicity of this one beats everything hands down! I have this hooked up to a blue line pump on a 100 gallon(total) system.....it pulls a ton of sludge out! I have to clean the neck and cup about every 4 days due to all of the brown sludge! My advice to anyone starting up a tank....don't be cheap,..you'll regret it!!....buy something big like this and you will have no worries! I've been through soooo much, and have used so many different types of skimmers. They all either overflow, inconsistent, or break easily. This one is basically set and forget!

1 out of 1 found this review helpful

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