Suspended solids and colloidal materials cause membrane fouling in RO system. In order to take some measure of the degree of this fouling problem, SDI test is required.
RO element specifications usually call for the SDI value to be below 5.
Water sources in a RO system often change their water quality and this often needs to be done weekly or monthly.
Features:
 According to the ASTM D4189-07 Norm
 Available in Seawater and Common Water Type
 In-Field flow calibration
 Uniform water distribution and complete venting
 Quick and convenient
 Easy installation and simple tools
 Lightweight and portable
 Special regulator for stable pressure
 Excellent seal of advanced O-ring