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Home » Aquarium Supplies  » Saltwater Supplies  » Protein Skimmers  »  AquaMaxx EcoMaxx EM300 In-Sump Protein Skimmer
AquaMaxx EcoMaxx EM300 In-Sump Protein Skimmer

AquaMaxx EcoMaxx EM300 In-Sump Protein Skimmer

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AquaMaxx EcoMaxx EM300 In-Sump Protein Skimmer Information

Product Manuals & Documentation

AquaMaxx EcoMaxx EM300 In-Sump Protein Skimmer

AquaMaxx EcoMaxx EM Series In-Sump Protein Skimmers efficiently remove organic waste from aquarium water. A powerful needle wheel pump generates optimally-sized air bubbles that force protein, waste and other materials into a collection cup for easy removal. The AquaMaxx EM Series is rated for aquariums 120-600 gallons yet are small enough to be concealed in a sump underneath your aquarium.

Computer-precision engineered and outfit with the latest filtration technology, AquaMaxx protein skimmers are engineered to deliver the performance and value you are looking for in a skimmer.

AquaMaxx EcoMaxx EM Series Skimmers are built using a brilliantly polished cell-cast acrylic. They incorporate the high-end features hardcore hobbyists demand at a price everyone can afford. The EM Series is equipped with bubble plates, modified cone necks, air silencers and needle wheel impellers for maximum performance, efficiency and whisper quiet operation. They also have compact footprints to make installation as easy as possible.

AquaMaxx EcoMaxx Skimmers feature custom Italian-made Sicce pumps with special needle wheel impellers to whip up large amounts of air with optimum bubble size. These pump and protein skimmer combinations deliver unprecedented performance and reliability. Aquarium waste will be vigorously removed from your tank so you can focus less on maintenance and more on enjoying your piece of the reef.

AquaMaxx EcoMaxx Protein Skimmers are designed from the ground up with the hobbyist in mind. The pump is incorporated into the base of the skimmer for a space-saving design that will be easy to incorporate into your filtration system. A built-in air intake silencer further reduces noise for near-silent operation. The specially-designed transition cone neck effectively moves skimmate into the collection cup for removal. Bubble plates decrease turbulence, improve bubble formation and help skimmer performance.

  • Volume Rating: 340 Gallons
  • Footprint: 9.1" x 13”
  • Height: 22.8”
  • Chamber diameter: 8”
  • Outlet size: 1.5” Quick-Precise adjustment valve
  • Pump (included): Modified Sicce 3.0
  • Pump power consumption: 27 watts
  • Air Intake: 270 GPH (1020 LPH)
  • Requires approximately 1/2" of clearance to remove collection cup.
  • Efficient, durable and reliable
  • Simple to set up and operate
  • Cell-cast acrylic construction
  • SCH80 fittings
  • Quick-Precise adjustment valve allows fast precision tuning of the skimmer water level to control wet/dry foam production
  • ShockMaxx rubber feet isolate noise and reduce vibration.
  • Italian-Made Sicce needle-wheel pump produces optimum bubble size for high-efficiency protein skimming.
  • Buffer chamber maximizes contact time allowing skimmate to move smoothly into the collection cup.
Model Item # Tank Size
Height FootPrint Pump Chamber
EM100 UJ00160 120 Gal 21.7" 6.3" x 8.6” Sicce 1.5 4.7"
EM200 UJ00161 240 Gal 22.8" 6.7" x 9.8” Shark 2.0 6"
EM300 UJ00162 340 Gal 22.8" 9.1" x 13" Shark 3.0 8"
EM500 UJ00163 500 Gal 22.8" 11" x 16” Shark 5.0 10"
EM600 UJ00164 600 Gal 22.8" 15" x 17" Shark 3.0 & 5.0 12"

All AquaMaxx products are backed by’s 60-day return policy and carry one-year manufacturer warranties. Each skimmer will include detailed instructions and diagrams to help hobbyists get up and running immediately.

Manufacturer Info

AquaMaxx is a Southern California-based aquarium supply company that entered the market in mid-2008 with a line of affordable metal halide bulbs. The brand quickly gained recognition as word spread about the high quality and low cost of their lamps. In 2009, AquaMaxx released a line of aquarium filter socks and, in early 2010, unveiled an assortment of high-performance protein skimmer accessories and upgrades.


AquaMaxx Limited Manufacturer Warranty
AquaMaxx will warrant all AquaMaxx products to be free from manufacturing defects for one year from the original purchase date when purchased through an authorized AquaMaxx retailer. This warranty does not cover any damages caused by misuse, neglect, alterations or improper handling/transport/maintenance/installation. AquaMaxx does not cover personal injury, personal loss, or other damages associated with the use of these products.

AquaMaxx EcoMaxx EM300 In-Sump Protein Skimmer Reviews

Average Rating
(30 reviews)
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of 3

Awesome Skimmer

Reviewers Rating Excellent!

Posted: 3/6/2015 from STATEN ISLAND, NY UNITED STATE
5.0 5
Experience Level: Intermediate

Comments: I have just set up the EM 300 on my 150 gallon fish only aquarium and this thing immediately started skimming all sorts of waste out of my tank. Very little break in period, super quiet, extremely well made. Coming from previously using a Reef Octopus on my 55 gallon tank which is also a great skimmer, this thing is just a monster. Great skimmer.

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Great Product

Reviewers Rating Excellent!

Posted: 1/2/2015 from Rocky Point, NC UNITED STATES
5.0 5
Experience Level: Expert

Comments: I love this skimmer. I'm using this on my 460 gallon shark hatching/grow out tank and am extremely impressed with how much skim mate this skimmer pulls from the system. I have to empty the collection cup every two days. Great skimmer for a great price. I will add that this skimmer works best in 8 inches of water.

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great product

Reviewers Rating Excellent!

Posted: 12/12/2014 from NEW ORLEANS, LA UNITED STATES
4.5 5
Experience Level: Beginner

Comments: This pump works great

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Aquamaxx 300

Reviewers Rating Excellent!

Posted: 12/4/2014 from Staten Island, NY UNITED STATE
5.0 5
Experience Level: Intermediate

Comments: This product is excellent. I switched my co1 skimmer for this one and I am not dissappointed. I wanted to test it out on my 125 tank, before i purhase a 220 and it definitely seems strong enough. My corals have not looked so large and healthy! It filters very thoroughly with great intake suction, leaving water debris free. This is the skimmer to choose.

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hope there prices level off

Reviewers Rating Great

Posted: 10/19/2014 from ALBUQUERQUE, NM UNITED STATES
4.0 5
Experience Level: Expert

Comments: I bought a EM 200 for my 150 Excellent product. Had it back ordered for months. Very energy economical, I was hoping to get 2 EM 500s for future fish tank 561 gal build. but supply and demand drove the price too high. Wish I ordered before the price hike as they were well worth it then.

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Pulls out nasty gunk

Reviewers Rating Excellent!

Posted: 10/12/2014 from LAKE IN THE HILLS, IL UNITED S
5.0 5
Experience Level: Intermediate

Comments: One week after hooking up this skimmer it pulled out a thick green, smelly muck from my 90g. I was running a decent skimmer before but obviously it was nothing compared to the EM200. I did have to wait three months to get it but it was worth it.

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Great skimmer!

Reviewers Rating Excellent!

Posted: 8/24/2014 from CHARLESTON, WV UNITED STATES
5.0 5
Experience Level: Expert

Comments: I purchased the AquaMax 200 and am totally pleased with it. It is very quiet, easy to setup and adjusting the flow is so easy. Maintenance is also very easy. The cup is easily removed. I would highly recommend this skimmer. I use it on my 90 gal mixed reef.

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Excellent Skimmer

Reviewers Rating Excellent!

Posted: 7/12/2014 from FAIRFAX, VA UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: I bought the 200 a year ago and I was blown away by the increased performance of this skimmer. I bought it for the height to be honest as it was the best skimmer rated that would fit a short cabinet for a 134g heavy load reef/fish tank. I'm keeping it in the 134g, but I'm getting the macdaddy 600 for my new 240 gallon tank. I wouldn't rate my old skimmer that I replaced the 200 with as bad, but rather the AquaMaxx as just that much better. As I've seen on the ratings, they packed it like they're sending you a cow, but hey, that's a real good thing. A+++ skimmers

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Reviewers Rating Excellent!

Posted: 5/11/2014 from MIAMI BEACH, FL UNITED STATES
5.0 5
Experience Level: Expert

Comments: I bought the EM300 off a friend of mine who was breaking down his tank and WOW - I really like it. It works great, has a small footprint and really does a good job of skimming my tank. I recommend it to anyone looking to get a good skimmer. Good skimmer.

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EM600 is the best!

Reviewers Rating Excellent!

Posted: 3/26/2014 from HB, CA UNITED STATES
5.0 5
Experience Level: Expert

Comments: I am in love with this EM600 for the reasons below: - Super quiet with dual Shark pumps - Space saving footprint design without sacrificing performance with huge 12" chamber - It's built flawlessly and looks amazing. - Price is right.

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of 3
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