Once coagulant chemicals have been added to raw water, it is essential to provide rapid agitation to distribute the coagulant evenly throughout the water. This is particularly true when alum or ferric salts are being used. The water must be briefly and violently agitated to encourage the greatest number of collisions between suspended particles.
The more common types of facilities used for rapid mixing (or flash mixing) are:
• Static mixers
• Mechanical mixers
• Pumps and conduits
• Baffled chambers
