Measuring, Sampling, and Analyzing White Waters, Test Method T 656 cm-20

This method presents procedures of white water evaluation so that different mills may use substantially the same procedures and thus establish a common basis of comparison. The complete method is intended to evaluate as accurately as possible paper mill white waters and to separate fibrous and nonfibrous constituents. For routine testing only those parts dealing with total solids, suspended and dissolved, correlated with rate of flow, for determination of inorganic and organic materials as mineral fillers, fibers, etc., may be adequate. The complete procedure, however, should serve as an excellent periodic check of routine methods. When checks are made, it is recommended that they cover periods of 1 to 2 weeks. 

This method is not intended for the analysis of environmental samples. Please refer to the proper published procedures designed for the analysis of environmental samples collected for regulatory purposes. If in doubt as to which method to choose, refer to the appropriate (Code of Federal Register) CFR reference for your samples.