DAF Clarifiers with Built-in Sand Filter

There are many ‘clean’ or ‘relatively clean’ water treatment applications where the treatment process involves clarification followed by sand filtration. These can be drinking water applications, process water for industrial use or tertiary wastewater treatment. If the clarification stage is done by dissolved air flotation, then it is easy to imagine that the idea of combining the DAF clarifier with a gravity sand filter has soon occurred to many engineers.