Our New Particulate Filter is rated @ 144 microns. The 144 Micron Particulate Filter on the suction side will drastically reduce cavitation, increase flow properties, lower the sound output of the FASS System, and removes larger fuel particulates. The new XWS3002 MUST be used in conjunction with the PF3001, the new filters cannot be used in combination with the FF3003/FF3010 or FS1001/FS1020. When replacing the discontinued filters with the new XWS3002 and PF3001, the XWS3002 will now be placed on the pressure side of the pump and the PF3001 will be placed on the suction side. PLEASE SEE THE LOCATION DIAGRAM ON THE NEW FILTERS FOR PROPER FILTER PLACEMENT!