Mar Cor Purification M4-13200, Operation And Maintenance Manual, Page: 8 / 60

M-Series Water Purification Machines
1238160 Rev. D 1 - 4 Description
CONCENTRATION
Concentration equals the Total Dissolved Solids (TDS) concentration of a
solution expressed as milligrams per liter (mg/L) or conductivity
(microSiemens/cm).
C
f
= Feed Concentration
C
p
= Permeate Concentration
C
c
= Concentrate Concentration
C
avg
= Average Concentration in machine
SALT (IONIC) REJECTION:
This equals the percent of dissolved salt rejected by the membrane,
calculated from an average concentration over the membrane.
SALT (IONIC) PASSAGE:
This equals (100% - rejection) or the percent of dissolved salts passed
through the membrane.
CONCENTRATION RATE (WASTE WATER RATE) [Qc]:
This is the flow rate of water stream containing rejected solids to drain in
gpm or gph (pm or m3/h).
FEED RATE [Qf]:
This is the flow of incoming water in gpm or gph (Lp or m3/h). Feedwater
rate equals permeate rate plus concentrate rate.
An example of how to calculate salt rejection and recovery is given below: