I have a question about a device named 'SDI meter'. We have recently bought a new device that the holder is from Sartorius company. This holder has two distributer that one is used as supporter for 0.45 micron filter. I want to know that the other one is a spare part or must be settled in the inlet of the holder?
It must be mentioned that inserting the second disk in the inlet, decrease the SDI value for one unit.