Spirits - 2 Stage Filtration

Double or two stage filtration is being increasingly used nowadays. Typically, the first stage uses XE5 for removal of larger particulate matter and XE 350K or any other of our speciality range are used to achieve high levels of polish or clarity in blended products. NA45K/NA70K is used for the polishing step for single malts. It is very important to avoid any surging or pressure shocks whilst filtering whisk(e)y because there is a build up of viscous oils on the surface of the filter sheet and excess flow rates or significant variations in pressure may force these oils through the pores of the sheet.

The maximum pressure drop tolerable across most filter presses is 2 bar and this level usually indicates that the filter needs to be cleaned and redressed.