One of twelve water treatment technology units, this student manual on filtration provides instructional materials for six competencies. (The twelve units are designed for a continuing education training course for public water supply operators.) The competencies focus on the following areas: purposes of sedimentation basins and flocculation units, rapid sand gravity and pressure filters, filter faults, backwash procedures, backwashing frequency, and backwashing filters. For each competency, student objectives, resources (information sheets and appendix materials), learning activities, and evaluation activities are provided. The appendices contain information sheets on rapid mixing and flocculation, sedimentation, filtration, and chemical coagulation and flocculation. Generally, an evaluation form and answer key are provided for each competency. (JH)