AquaC EV-240 Protein Skimmer With Mag-Drive 18 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: 26"
  • Recommend Pumps: Mag Drive 12 or Iwaki MD40RLT
  • Footprint: 6.75" x 10.75"
  • Foam Tower: 6" OD
  • Tank Size: 100-240 Gallons
  • JG Fitting: Standard 1/4" JG fitting
  • Bubble Size: .03–.05mm
  • Water flow-thru rate: 550gph
  • Volume of foam produced: 320cu.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 8-1/2" high

Mag-Drive 18 Specifications:
  • Flow Rate: 1800 GPH maximum flow with a 21` shut-off
  • Power Consumption: 145 Watts
  • Pump Size (L x W x H): 6.4" x 4.5" x 4.6"
  • Outlet Size / Inlet Size: 3/4" MPT / 3/4" FPT
  • 10` grounded power cord
  • 5 year manufacturer`s Warranty
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

Product Manuals & Documentation

AquaC EV-240 Protein Skimmer With Mag-Drive 18 Pump

Owner's Manual available for download in Adobe PDF file format

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

Manufacturers Warranty (Pump): 1 year manufacturer warranty

28 Reviews



Experience Level: Intermediate


AquaC has the worst customer support I've ever dealt with. It is impossible to get warranty service or support because they do not return phone calls or respond to emails. While I really like the skimmer, I suggest thinking twice before purchasing.

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Experience Level: Expert

5 year review

So I rarely write reviews...generally only if the product was excellent or absolutely crap! Well in this case its definitely the former. I have had my EV240 for 5 years and it has worked consistently well in my sump. The nozzle clogged on a couple of occasions but was easily cleaned. Unless you can come up with a way for this thing to be self-cleaning I dont see how it can be improved! This week the top cup cracked and I needed a replacement. The customer service was excellent....prompt, helpful and easy to facilitate a replacement. When I need a new skimmer I dont see myself moving away from AquaC...well made, high quality, functional and with great service...thats a rarity in my experience.

1 out of 1 found this review helpful

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Experience Level: Intermediate


This skimmer is amazing. I wish it wasn't so tall, but that's my only complaint. I read a lot of reviews about the break in period, but what worked for me wasn't in the manual. I started it up the the 1/8" connection plugged and the air vent valve closed. Over a period of 2 days I slowly opened the air valve. Now it's fully open and the plug removed. Skimming like crazy. I have it draining into a 5 gallon bucket that after 24 hours only has about 2" of skim mate inside.

1 out of 1 found this review helpful

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Experience Level: Intermediate

Bubble Making Wonder

This Skimmer is a bubble making wonder. My old skimmer was just barely able to do the job, due to its design. This new AquaC EV-240 and its spray injection nozzle, coupled with the Mag 18 pump is truly amazing. I had dark green skimmate being collected in no time. This made me realize how well this type of system works. I like this type of design also, because it doesn't need a "sweet spot" level of water in your sump. It's a very good choice for my 225 gallon tank.

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Experience Level: Intermediate


I have only had this skimmer installed for two days, but It produced gunk the first night! This is not your ordinary skimmer. I put the Mag 1800 on it and its very strong.High quality construction, It is easily adjusted, quiet, except for the projectile water shooting out the side. I had a problem with it splashing out of the sump and wetting my stand. I had to add a 90 degree fitting so it would flow down instead of out. You can also use a T fitting. (The 90 fitting will need a air hole to prevent syphoning the skimmer dry!) I highly recommend this skimmer to anyone .

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Experience Level: Intermediate

AquaC EV-240

This Skimmer is working soo good!!

1 out of 2 found this review helpful

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Experience Level: Intermediate

works great as promised!

initially it took 96 hours to break in since then it produces 2 cups of skimmate a day. deffinetly a good investment for someone looking for a high quality protein skimmer.

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180g reeftank from


Experience Level: Intermediate

Better than expected

It was hard to pull the trigger for this product because of the cost. I can tell you now 8 months later, it was worth the money. My tank had always struggled with algae green or red, I would get it under control then it would creep back. This skimmer has really made a major difference in my enjoyment level of the tank. Mark

1 out of 1 found this review helpful

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Experience Level: Intermediate

works great.

I have been using this skimmer for 9 months. The skimmer produces a lot of watery skimate. My nitrates stay between .5 and 1 despite a slightly overstocked 125 mixed reef with a 55 refug. No problems with leaks but there is a small crack in the collection cup probably from cleaning every other day. It does get dirty quick especially in the neck below the collection cup.

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Experience Level: Intermediate

Excellent Skimmer!

I replaced my high end Tunze with this; and there is no comparison in the skimming volume. This skimmer with a Mag 18 is a beast! Tricky to adjust during the first week as it breaks in; so definitely keep the waste line inside the sump.

1 out of 3 found this review helpful

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