Altmann Analytik HPLC Guard Cartridges Stability 100 Alumina, 5.0 μm, 2 x 20 mm, 5pc/PAK

Precolumns offer the advantage that they also retain molecules which would enter into an irreversible bond with the column material. Both filters and precolumns should be replaced regularly. A good indication of the time of the exchange is a gradual increase in the back pressure.