... Oil Purifier-- renew all kinds of lubrication oils, e.g.: gear oil, hydraulic oil freezer oil,hydraulic oil, compressor oil, vacuum pump oil, internal-combustion oil, heat treatment oil ... with an additional pressure sheet frame purifier.3) DYJ-T: used for purifying the oils those contain too ... much acid; or discolor4) DYJ-S: used for purifying the oils those contain too much water because ...