The dynamic plume of Otterbine’s Gemini pattern offers incredible aeration strength and tremendous beauty in any setting.


Gemini Aerating Fountain

The dynamic plume of Otterbine’s Gemini pattern offers incredible aeration strength and tremendous beauty in any setting. Systems range in size from 1HP-5HP; all with a 5-year warranty.


Offering the industry's strongest, most comprehensive 5-year warranty, our Aerating Fountains are backed by a "Pattern Guarantee", if you don't love the pattern we'll swap it out for another! Check out these other great features:

Complete Package

Most systems come complete with unit, power control center, and cable with cable quick disconnect standard for ease of installation.

Proven Performance

Otterbine is the only manufacturer to have oxygen transfer and pumping rates independently tested and published on their aeration systems.

Shallow Operating Depth

Operates in 30in or 75cm of water.

Safety Listed & Protected

Package electrically safety tested and listed with ETL & ETL-C. Products for European Union are also safety tested, approved and carry a 3rd party independent CE mark.

Natural & Effective Water Quality Solutions

Introduces oxygen into the water for a natural solution to water quality management; effectively controlling algae, aquatic weeds, and odors.

Energy Efficient

Low amperage systems mean less electrical consumption and low running costs.


Product Specifications: Gemini

60Hz 1HP 2HP 3HP 5HP
Spray Height (ft) 5 9 12 15
Spray Diameter (ft) 10 16 24 34
GPM 555 665 800 1,125
Voltage/Phase/Amp 3450rpm@60Hz 115/1/15 230/1/7.5 230/1/12.4 230/1/14 230/3/8.6 460/3/4.3 230/1/23 230/3/13.4 460/3/7.2
50Hz 1HP 2HP 3HP 5HP
Spray Height (m) 2 2.6 3.5 4.4
Spray Diameter (m) 4 4.7 6.9 9.5
m3/hr 119.7 143.5 172.6 242.7
Voltage/Phase/Amp 2875rpm@50Hz 230/1/8.3 230/1/12.6 230/1/13.5 400/3/4 400/3/7

Unit shipped complete with unit, cable and Power Control Center. 50Hz applications do not receive a Power Control Center. Unit average weight is 155 lbs or 73 kg. Minimum operating depth is 30in or 75cm. Spray performance and pumping rates are approximate and may vary due to voltage, elevation and relative humidity.


Unit Construction

The Concept 3 Aerating Fountains have been designed and engineered by expert craftsman to provide a high quality, ease of use product that delivers results.

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Corrosion Resistant Materials:

All components are manufactured of stainless steel or thermoplastics for use in brackish and effluent waters.

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Easy Handling:

Smaller and lighter, with handles molded into the float for easier maneuverability, installation & storage.

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Interchangeable Patterns:

Staged pumping chambers provide an option to change patterns in less than 30 minutes.

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Simplified Design:

All metric fasteners and only three tools needed to work on the entire unit.

Unit Illustration

Unit Illustration of the Otterbine Gemini Aerating Fountain
  1. 1

    High-tech thermal plastic pumping chambers are staged to allow for easy interchange.

  2. 2

    Rugged low visibility closed cell foam filled includes handles and protective pockets for lights when applicable.

  3. 3

    Mixed flow pumping systems achieves maximum pumping capacities.

  4. 4

    Electrical quick disconnect is part of the upper plate to prevent damage

  1. 5

    Industrial strength thermal plastic screen helps keep debris out of the unit.

  2. 6

    Oil cooled, efficient 3450/2875 RPM custom built motor incorporates a g-type seal to ensure dependability and long life.

  3. 7

    Corrosion resistant, durable 18 gauge/316 grade stainless steel motor housing.

Complete package is electrically safety tested and listed with ETL, ETL-C and CE, and includes unit, cable and power control center. 50Hz units do not receive power control center.


The Gemini arrives partially assembled and installation can be performed in just a few steps.

  1. 1

    Install Power Control Center: Power control center is mounted onshore; a certified electrician is recommended to perform this step.

  2. 2

    Lay Power Cable: Bury/trench power in conduit to pond edge, connect plug to unit.

  3. 3

    Float System in Water & Anchor/Moor into Place: Depending on method selected, the use of a boat may be required.


Maintenance & Winterization


Aerating Fountains require minimal maintenance, to insure years of dependable service we recommend the following:

  • 1

    Once a year: Disconnect unit from power and physically inspect aerator, float and electrical cable.

  • 5

    Every three years: An oil change is suggested to keep your aerator running smoothly.


These units can remain in the water during the winter but need to run a minimum of 12 hours per day; if temperatures drop BELOW 20° Fahrenheit or -7° Celsius they need to be run 24 HOURS A DAY.

NOTE: Units should never be stored upside down.

Suffering from Pond Algae, Odors or Other Poor Water Conditions?

Otterbine Aerators Deliver Results, Let Us Create a Water Quality Management Solution for You Today!