Fine debris from miscellaneous substances and pump / injector etc. contained in the analysis sample accumulates in the column, causing degradation of column performance. 

Please connect a guard filter when using CHIRALPAK ZWIX (+) / CHIRALPAK ZWIX (-) or when using 2.1 mm ID column. 

The guard filter kit is a set of parts necessary for using the guard filter. If you are using the guard filter for the first time, please select the guard filter kit.