Evaluation of an Innovative Sand Filter for Small System ... - US EPA
Results of evaluation of an innovative sand filter that uses the concepts of both slow and rapid sand filtration are presented in this article. The system uses a low-cost "Drum Sand Filter" (DSF) that consists of a 55-gallon drum filled with layers of sand of varying size. A low-cost "Drum Flocculator" (DF) and tablet chlorination are incorporated before and after the …