Clean Screen® THC is a mixed-mode column, consisting of hydrophobic and anion exchange functionalities. It was the 2nd product in the flagship line and has performed consistently over the last 20 years. UCT's method allows for the extraction of both the parent drug and its metabolites. Additionally, its dual functionality is useful for acids and hydrophobic compounds. Reduced Solvent Volume is a small particle, small bed SPE column designed for reduced solvent usage and more economical extractions of drugs of abuse and clinical compounds.