Radial disc impeller apparatus and method

Radial injector for aspiration of gases

Replaceable seal module for liquid aerators

Retrofit pulsator apparatus and method for an air/water mixer of

Reversible humidifier housing

Rotary aerator

Rotary disk humidifier

Rotary drum humidifier

Rotary drum humidifier

Rotary heat and/or mass transfer arrangements

Rotary surface aerator with adjustable liquid transporting units

Rotary surface aerators

Rotating gas diffuser

Rotating humidifier

Rotor adapted to rotate about a rotary shaft

Rotor film column for making contact between gas and liquid

Rotor film mass and heat exchanger

Rotor-carburetor having an idling mixture arrangement for intern

Rotor-type carburetor apparatus and associated methods