Random packing materials
Reactor for injection of gas into a liquid
Reactor for purification of water
Reciprocating biological contactor and method of use
Recirculation of wastewater in a filtration bed
Reef biological filtration device
Removing hazardous contaminants from water
Ribbon-tube biofilter
Rotary apparatus adapted to bring at least two media of differen
Rotary biological contactor
Rotary distributor speed control system for trickling filters
Rotating biologic aquarium filter system
Rotating biological aquarium filter system
Rotating biological contactor
Rotating biological contactor
Rotating biological contactor apparatus
Rotating biological contactor apparatus
Rotating biological contactor for the biological purification of
Rotating biological contactors for the treatment of waste water
Rotating biological filter system