Ontwsep™ Celite SPE CartridgesOntwsep Celite is relatively inert, meaning it generally doesn't interact chemically with the analytes of interest. This makes it suitable for applications where you want to remove particulates without altering the chemical composition of your sample. These cartridges are used for the removal of "tar" and particulate materials (e. g., catalysts, insoluble metal oxides, Pd C), often during the initial work up stages of organic synthesis.