NOTES FROM DIFFERENT SOURCES AND PERSONAL  Performance of some FILMTEC membranes SW30HR BW30 XLE NF270 Feed pressure (psi) 370 150 70 50 Feed pressure (bar) 25 10 5 3.5 Rejection (%) Sodium chloride NaCl 99.7 99.4 98.6 80 Calcium chloride CaCl2 99.8 99.4 98.8 50 Magnesium sulfate MgSO4 99.9 99.7 99.2 99.3   At 18 ... Read More »