Normalized Permeate Flow - Normalized permeate flow (NPF) refers to a calculation that allows the comparison of a measured permeate flow rate to a standard (or start up) condition.

Permeate flow is a function of the Net Driving Pressure (NDP), temperature and membrane condition. By normalizing measured permeate flow for observed NDP and temperature, a measure is obtained that can be used to compare the condition of the membrane to the original start up conditions. A decrease in the NPF of 10-15% indicates that RO membrane cleaning is required.

Technical support and advice

Reverse Osmosis Chemicals International work closely with a diverse range of global organisations, intelligently combining advanced treatment technologies with practical solutions to resolve complex issues. If you have a project you would like to discuss, or you require technical support and assistance; or if you simply have a question about our reverse osmosis technology solutions please contact one of our specialist advisors using our Technical Support page or call us on +44 (0) 330 223 31 31.