Standard Test Methods for
Operating Characteristics of Reverse Osmosis and
Nanofiltration Devices1

This standard is issued under the fixed designation D 4194; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of the last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 These test methods cover the determination of the
operating characteristics of reverse osmosis devices using
standard test conditions and are not necessarily applicable to
natural waters. Three test methods are given, as follows:
Sections
Test Method A—Brackish Water Reverse Osmosis Devices
8-13
Test Method B—Nanofiltration Devices 14-19
Test Method B—Seawater Reverse Osmosis Devices 20-25

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.

2. Referenced Documents

2.1 ASTM Standards:
D 512 Test Methods for Chloride Ion in Water2
D 1125 Test Methods for Electrical Conductivity and Resistivity of Water2
D 1129 Terminology Relating to Water2
D 1193 Specification for Reagent Water2
D 6161 Terminology Used for Crossflow Microfiltration,
Ultrafiltration, Nanofiltration, and Reverse Osmosis Membrane Processes3

3. Terminology

3.1 Definitions—For definitions of terms used in these test
methods, refer to Terminology D 1129 and D 6161.

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