GEM® System

Patented Primary Wastewater Treatment

Patented GEM System

Since the middle of the 20th Century, very little has changed in wastewater treatment (WWT) regarding flotation and flocculation. Industrial plants have had few options available to clean water, until now.

Clean Water Technology’s (Gas Energy Mixing) GEM® System is an innovative and patented approach to wastewater treatment. This superior flocculation and flotation system delivers results significantly better than alternative wastewater treatment technologies.

The GEM System removes higher levels of contaminants than conventional dissolved air flotation (DAF) systems, using less chemicals, while generating significantly drier sludge. The GEM System footprint is over 50% smaller than a typical DAF (dissolved air flotation) of similar capacity.

Next Generation GEM System

The GEM System: most sustainable primary wastewater treatment system for the removal of TSS (total suspended solids,) FOG (fats, oils, grease,) and undissolved materials.

Request information about a GEM® System demo or trial in your facility.

The GEM System uses unique hydro-cyclone technology in the Liquid, Solid, Gas Mixing Heads (LSGM.) In these heads, chemistry is injected and air is dissolved into 100% of the wastewater stream while creating a vortex. The random flocculation and flotation process of a DAF system becomes a managed process in the GEM System resulting in the removal of more contaminants and drier sludge. 

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GEM® System Differs from DAF Systems for Wastewater Treatment

The patented LSGM – liquid solid gas mixing heads manages the flocculation processes in a precise manner.  Using air pressure (psi), a vortex, or hydro-cyclone, is created in each head, allowing bubbles to spin at various speeds and energies.  As the wastewater moves through the system, strictly controlled pressure drops allow bubble formation in various sizes all the way to nano-bubbles.  Small waste particles are more likely to attach to smaller bubbles.

In the LSGM heads towards the end of the process, long chain polymers are injected under pressure.  They uncoil giving more area of charge sites for waste particles to attach. 

Prior to the last LSGM head, the pressure is dropped to ambient pressure and the flocs, already formed around the waste particles, pop to the top of a bloom chamber.  

By the time the wastewater enters the flotation tank, the solids and liquids are already separated.  The tank is only used to skim the solids. This is why the tank can be so much smaller than a conventional DAF (dissolved air flotation) system.

Design of GEM System - Better waste removal than DAF
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Unique Design of Primary Wastewater Treatment System
Through aerating 100% of the wastewater under constant flow, the GEM® System creates many more bubbles than a conventional DAF system, to which waste particles of large or nano size (and in between) can attach.

By using a series of liquid solid gas mixing (LSGM) heads (usually 6,) a vortex is created that allows the bubbles to spin at various mixing speeds and energies.

Pressure is dropped in each head under strict control.  This is important in that smaller particles are more apt to attach to particles similar in size – all the way to nano-bubbles.  This means that the GEM System can achieve 99% removal of TSS (total suspended solids) with no carry-over or pin flocs.

Between heads 4-6, polymers are directly injected, under pressure, where they continue through the vortex.  As the polymers enter the LSGM heads, they uncoil, availing more charge sites to attach to more waste particles.  (See Chemistry of the GEM System.) By the time the wastewater enters the flotation tank, the solids and liquids are already separated.  The flotation tank is used only to skim the solids.

Patented Process

The precise working of the LSGM heads is a patented process that produces better floc seeding and smaller bubbles that attract smaller waste particles, resulting in a cleaner effluent.

The addition of anionic, cationic and coagulant in the LSGM heads depend on the type of wastewater being processed.  Our chemical scientists will make specific recommendations when the wastewater treatment system is being designed and installed.  

Our customers use less chemicals with the GEM System than with other wastewater treatment systems and save on chemicals and money. 

In addition, we offer online training and in person training for operators to help them get the  best results possible in clean water. 

Clean Water Technology guarantees results and we will provide guidance for our customers to achieve their clean water goals.


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  • Better pollutant removal – up to 99% of TSS and FOG
  • Less space requirements 
  • Drier sludge
  • Efficient and less chemical usage
  • High quality effluent
  • Secondary and tertiary treatments are less expensive and smaller because of the efficiency of the GEM System
  • Expandable – same unit can handle increasing loads and flows
  • Easy installation


Liquid Solid Gas Mixing Heads

CWT GEM® System Advantages:

  • Better contaminant removal rates than DAF systems.
  • Adaptability – the GEM System adjusts to higher flow rates and higher contaminant levels without equipment changes.
  • Less chemicals – uses 20%-80% less chemicals than DAF systems.
  • Smaller Footprint – uses less space than other flotation and flocculation systems.
  • Drier Sludge –  the technology of using long chain polymers produces drier sludge (8 to 13% drier and over 20% after decanting.)

Clean Water Is Our Mission

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Talk to an expert about the patented GEM System. CWT provides wastewater treatment system solutions to global industries.