What Turbidity Measurements Can Tell Us

While alternative methods for measuring filter performance such as particle counters and monitors are increasing in importance, the turbidity measurement continues to have a significant place in water plant operations. All techniques have limitations and, consequently, no single method can provide all the answers to monitoring filter performance. In the future, many systems will need to use a combination of measurements. This article describes the turbidity measurement and the proper sampling and measurement techniques needed to analyze high-quality filtered water as mandated by US Environmental Protection Agency regulations. © 1994 American Water Works Association.