Words to Describe clarifiers

How clarifiers often is described ("________ clarifiers")

• intermediate
• chinese
• upward
• shallow
• bottomed
• modern
• pass
• secondary
• value
• activated
• type
• sludge
• parallel
• upflow
• primary
• advanced
• flocculator
• conventional
• identical
• cylindrical
• mechanical
• centrifugal
• beer
• scale
• circular
• rectangular
• separate
• horizontal
• bottom
• trained
• continuous
• final
• standard
• reactor
• multiple