The Ghost Trap DS cartridge has an activated charcoal packing to trap impurities and contaminants from HPLC system parts and solvents, and can significantly reduce the appearance of ghost peaks. It is most effective when installed after the mixer, and lasts for 500 or more gradient runs. Working pH 2-12, maximum pressure 35 MPa (5100 psi). Dead volume of approx. 700 uL. Not recommended when using ion pairing reagents or when a mass spectrometer is used as the detector.