... 2.GPD:10500 3. BW, LP,XLE,TW series optional LP ro membrane for water treatment filter specificationN ... strictly and treated with 1.0% NAHSO3 for storage (propylene glycol antifreeze is added in winter ) before ... .is bidden to add in the period of storage ,installation and normal function .when install ,please ... series 8.0inches .Certificate:working theory : LP ro membrane for water treatment filter