Standard Historical Last Updated: Aug 16, 2017
ASTM D3739-94(1998)

Standard Practice for Calculation and Adjustment of the Langelier Saturation Index for Reverse Osmosis


1.1 This practice covers the calculation and adjustment of the Langelier saturation index for the concentrate stream of a reverse osmosis device. This index is used to determine the need for calcium carbonate scale control in the operation and design of reverse osmosis installations. This practice is applicable for concentrate streams containing up to 10 000 mg/L of total dissolved solids.

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Book of Standards Volume: 11.02
Developed by Subcommittee: D19.08
Pages: 4
DOI: 10.1520/D3739-94R98
ICS Code: 07.030