Formerly under the jurisdiction of Committee D19 on Water, this terminology was withdrawn in January 2019 in accordance with section 10.6.3 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

The need to understand the relationships found in membrane unit processes for water treatment increases with the continuing demand for these separation systems. Defining the terms common to microfiltration, ultrafiltration, nanofiltration and reverse osmosis processes assist the manufacturer, consultant and end-user in eliminating inter-process terminology confusion. This standard expands the definitions found in Terminology D1129.

1.1 This terminology covers the use of microfiltration, ultrafiltration, nanofiltration and reverse osmosis for membrane separation processes.